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Old 05-23-2010, 06:56 PM   #1
F1 Flathead
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Default Holly 94 jet recommendation for a flathead running open exhaust?

I'm running a mostly stock 40 Merc flathead with a mild cam in my 29 roadster. I'm running stock exhast manifolds with a just a short, 3 foot open pipe on each side. The engine missfires at high rpm. I've gone through the ignition and am now thinking I need to richen up the jets a bit. Can someone recommend a jet number for me? Also, I'm just running the holly powervalve that comes in the standard kit. I remember reading that it is not really correct. I've forgotten which of you has the proper powervalve available for that carb. Can you let me know? I know this was all available on the old Fordbarn but I didn't find anything when I searched this new setup.
Thanks guys!
Dan
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Old 05-23-2010, 07:31 PM   #2
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

As for the power valve, try a 5.5. The kits come with a 7.5. Ken ct. has a "drop in" pv, but if you don't mind grinding a little on the inside of the fuel bowl, you can use a modern Holley pv.
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Old 05-23-2010, 10:06 PM   #3
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Most Holley 94's I've taken apart have #51 jets.
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Old 05-23-2010, 10:50 PM   #4
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

You say you have gone through the ignition. What exactly did you do?
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Old 05-24-2010, 06:56 AM   #5
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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You say you have gone through the ignition. What exactly did you do?
I'm running a "diver helmet" dist. I took it off, cleaned and lubed it, got the vacuum break operating, installed and gapped new points. It would run reasonable well until the coil would heat up and then begin to run very poorly. I made my own coil adapter out of the coil base and installed a remote Echlin 6 volt coil and matching condenser. That took care of 90% of the symptoms. It now runs strong to high rpms and does not get worse as it warms up. In fact, it gets better. it just missfires some. My theory is that I am running borderline lean because of the open pipes (which tend to lean out an engine). I'm planning to get some jets and begin richening the mixture to see what effect it has. I was just hoping that one of you could say "been there, done that, start with a number whatever jet". I haven't completely ruled out ignition trouble. I really have only set the timing by feel, as I usually do on my engines. I set the base timing by vacuum level and then backed the vacuum break all the way out and still don't have any knock, so I'm thinking I can't be too far off. This winter I will pull the dist. and get it curved but don't want to leave the car down now since I am having loads of fun driving it.
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Old 05-24-2010, 06:59 AM   #6
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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As for the power valve, try a 5.5. The kits come with a 7.5. Ken ct. has a "drop in" pv, but if you don't mind grinding a little on the inside of the fuel bowl, you can use a modern Holley pv.
Can you point me to the procedure for grinding the bowl to use a modern pv? That sounds like the procedure for me since I am a cheap bastard and never want to pay for anything I can do myself. I know I have seen it before on Fordbarn or somewhere but don't know how to find it now.
Thanks,
Dan
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Old 05-24-2010, 07:16 AM   #7
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

You don't need to grind the bowl or turn the bottom of the power valve as some have suggested. You need the right gasket. The gasket that comes with a Holley Performance valve is triangular shaped and don't seal on the old carbs. You need a gasket the fits snug on the power valve threads and is about .080 to .090 thick and is not bothered by fuel and has some give to it so it shapes to the power valve and seat as it is tightened. I have used a 100 of them and never have any leaking problem. Try some Marvel Mystery oil down both sides of the carb when it is running and a 1/2 quart in the fuel tank the first treatment and 1/2 pint with every fill up. This new fuel causes sticky valves. The distributor needs to be set on a strobe machine, feeler gauges don't work. G.M.
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Old 05-24-2010, 07:31 AM   #8
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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You don't need to grind the bowl or turn the bottom of the power valve as some have suggested. You need the right gasket. The gasket that comes with a Holley Performance valve is triangular shaped and don't seal on the old carbs. You need a gasket the fits snug on the power valve threads and is about .080 to .090 thick and is not bothered by fuel and has some give to it so it shapes to the power valve and seat as it is tightened. I have used a 100 of them and never have any leaking problem. Try some Marvel Mystery oil down both sides of the carb when it is running and a 1/2 quart in the fuel tank the first treatment and 1/2 pint with every fill up. This new fuel causes sticky valves. The distributor needs to be set on a strobe machine, feeler gauges don't work. G.M.
GM, I like the gasket idea. I admit I was mystified by the triangular gasket that came with the kit. I think I reused the one that was on the carb instead. I'm not sure I know what I'm trying to seal from your describtion. The flange (hat brim) of the valve should be sealed tight to the carb body, right? I will try some MM oil. I do think that sticky valves is a real possibility on this motor. It was rebuilt in the 70s and then sat for most of the time until I bought it a few years back. All I did was change the oil and and give it a fresh coat of paint. Here's a clip of it starting for the first time. I'm the dorky looking guy who didn't bother to change out of his work (office) clothes before heading to the garage after work.
https://www.youtube.com/watch?v=UpGQa0SjPNg
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Old 05-24-2010, 07:32 AM   #9
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Not sure your on the lean side,could be too rich.I have the 5.5 PV with the correct gasket. 7.5 open too quick. I have bigger jets but dont think thats your problem.I would run .050 in it.ken ct. 1-203-260-5945 or igadore@sbcglobal.net.
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Old 05-24-2010, 07:55 AM   #10
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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Originally Posted by G.M. View Post
You don't need to grind the bowl or turn the bottom of the power valve as some have suggested. You need the right gasket. The gasket that comes with a Holley Performance valve is triangular shaped and don't seal on the old carbs. You need a gasket the fits snug on the power valve threads and is about .080 to .090 thick and is not bothered by fuel and has some give to it so it shapes to the power valve and seat as it is tightened. I have used a 100 of them and never have any leaking problem. Try some Marvel Mystery oil down both sides of the carb when it is running and a 1/2 quart in the fuel tank the first treatment and 1/2 pint with every fill up. This new fuel causes sticky valves. The distributor needs to be set on a strobe machine, feeler gauges don't work. G.M.
Yes GM, you do. Your information is false. If he was to buy a HOLLEY power valve, as "some" suggested, the brass spring retainer at the top is TOO big to fit in the fuel bowl well. It WILL bind against the bowl and the valve will NOT work.

Following your advice, a fellow could buy an aforementioned power valve, get the "right" gasket, and not know why his carb isn't working. And no, MMO would not free this valve up.
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Last edited by 1952henry; 05-24-2010 at 08:18 AM.
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Old 05-24-2010, 08:06 AM   #11
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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Yes GM, you do. You information is misleading. If he was to buy a HOLLEY power valve, as "some" suggested, the brass spring retainer at the top is TOO big to fit in the fuel bowl well. It WILL bind against the bowl and the valve will NOT work.
So I need to check the fit of the brass spring retainer to the float bowl and open the hole up a bit if it is binding, correct?
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Old 05-24-2010, 08:16 AM   #12
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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So I need to check the fit of the brass spring retainer to the float bowl and open the hole up a bit if it is binding, correct?
Yes, if you buy a modern Holley power valve. Remove the airhorn and watch as you screw the Holley power valve in. Almost right away you will see the brass retainer make contact with the well. If you screw it in tight, you will not be able to push it down like you should be able to. I use a carbide Dremel bit to remove some material, then try again. It doesn't take much, and you have plenty of "wall" to work with.

For gaskets, I like to use viton square-shouldered o-rings. They aren't bothered by fuel, offer a great "crush" (sealing), work with either the older-style pvs, or the new Holleys with their odd gasket surface.

IF, you do use a Holley that requires grinding, be careful to cover up the jets and thoroughly rinse out the bowl. You don't want any chips getting into the plumbing.
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Old 05-24-2010, 08:31 AM   #13
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

I wouldn't bother with the grinding crap.Buy the proper PV and gasket.Also all MJ's marked .051 dont even mike out to .051. there in the range of .048-.049. they use a diff measuring system than strom ones which are exact size of the hole. ken ct.
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Old 05-24-2010, 08:35 AM   #14
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

I will check this out ASAP. If my power valve is not able to open, that would exactly explain the issue I am experiencing. After I fix this issue, I may move to a second problem of my powervalve opening too soon due to the reduced vacuum levels with my cam so I think I'll make the jump to the 5.5 PV at the same time. Thanks for the help. I'll post some feedback just as soon as I can check this out.
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Old 05-25-2010, 06:38 AM   #15
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Here's an update on this issue. I pulled the carb apart last night. It has .051 jets as predicted. The power-valve is the correct style in that it does not interfere with the carb body, but it is not labeled other than it is stamped "Keller". It appears to function properly. It is normally open and closes when I apply vacuum, although I can't tell exactly when it is closing. I think I'm back to square one since this valve appears to be doing it's job. I've got another carb I can throw on just as a test. Other than that, does anyone have any suggestions?
Thanks,
Dan
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Old 05-25-2010, 07:08 AM   #16
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

About 75% of the carb related misfiring can be traced to the ignition system.
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Old 05-25-2010, 07:20 AM   #17
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

JWL is correct, sounds like ign. maybe points are floating a high rpm's ?
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Old 05-25-2010, 07:51 AM   #18
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

F1, The Holley Performance power valves work better then the stock type valves. The stock valves have generic springs and open at differant vacume values then marked. The Performance valves are adjusted after they are assembled opening at exactly where they are marked. They are also manufactured recently with modern materials not some barrel of valves that was found sitting in a warehouse for 40 years. I did fail to mention that the round adjustment nut on the top of the valve is a little larger in diameter and the flat spot above the threads in the bowl must have a few thousanths of material removed with a die grinder to clear. There is close to 3/16" of material there so it don't hurt anything. And Henry the right gasket does seal the valves and these valves have a much longer life then the stock valves. I have never had to replace one in over 15 years. G.M.
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Old 05-25-2010, 08:26 AM   #19
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

GM, thanks for the detail on the powervalve. I will pick up a 5.5 Holley and make the modifications so it fits. The one in there now is an unknown so I need to replace it.
JWL and jdl, I think some new points is a good next step. It's been a while since I put this pair in and I can't swear as to their origin. I might have filed a used set and reused them, since I'm a cheap bastard, as previously mentioned. I picked up a set of Echlins from NAPA and will but them in to answer the point bounce issue. It sure could be that. I've been putting off installing them because I have to pull my radiator to get at them with that darned "diver's helmet" dist. and I've been too lazy to tackle it.
Thanks for all the good advice. I'll keep you posted.
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Old 05-25-2010, 08:59 AM   #20
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Boy lazy and cheap what a combo.You dont have to modify my power valves they fit right out of the box and have the correct gasket nor grind the bodys to fit. Also carry American made points but as you say your a cheap bastard who dosn.t take anyones advice anyway. ken ct. Do as you wish/ good luck
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Old 05-25-2010, 09:16 AM   #21
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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Boy lazy and cheap what a combo.You dont have to modify my power valves they fit right out of the box and have the correct gasket nor grind the bodys to fit. Also carry American made points but as you say your a cheap bastard who dosn.t take anyones advice anyway. ken ct. Do as you wish/ good luck
Mostly cheap, not really so lazy. My car is all hand made by me the hard way. I don't buy anything or pay anybody to do anything I can do myself with my mig welder and grinder. I do appreciate the advice, though.
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Old 05-25-2010, 12:42 PM   #22
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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Boy lazy and cheap what a combo.You dont have to modify my power valves they fit right out of the box and have the correct gasket nor grind the bodys to fit. Also carry American made points but as you say your a cheap bastard who dosn.t take anyones advice anyway. ken ct. Do as you wish/ good luck
Hey Ken, you've got to learn to quit sugar coating everything and just speak your mind.
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Old 05-25-2010, 11:03 PM   #23
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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F1, The Holley Performance power valves work better then the stock type valves. The stock valves have generic springs and open at differant vacume values then marked. The Performance valves are adjusted after they are assembled opening at exactly where they are marked. They are also manufactured recently with modern materials not some barrel of valves that was found sitting in a warehouse for 40 years. I did fail to mention that the round adjustment nut on the top of the valve is a little larger in diameter and the flat spot above the threads in the bowl must have a few thousanths of material removed with a die grinder to clear. There is close to 3/16" of material there so it don't hurt anything. And Henry the right gasket does seal the valves and these valves have a much longer life then the stock valves. I have never had to replace one in over 15 years. G.M.

Thank you for clearing that up. I just didn't want anyone who may not know about this to unknowingly create a new problem while trying to solve another.
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Old 05-25-2010, 11:41 PM   #24
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

What is your intake? My intake Runs so cool I had to go rich. It took me a week to make it run good. I forgot what power valve I ended up with but my main jets are 58s. I was running 56 mains but on the dyno it was showing a little lean. I put over 2000 miles on this set up ran mint til I broke a piston.



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Old 05-26-2010, 05:06 AM   #25
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

That's a very cool banger set-up. I am still running the stock 40 Merc intake so I don't have the cold runner issue that you do. It's interesting that you are running jets so much richer than my stock .051s. I will definitely try running richer when I can get over to the drag strip to check my times on the "poor man's dyno". I put the carb back together last night and spent some time driving and just listening to the motor at higher rpms and am beginning to think that the comments that I still have an ignition problem might be right. I think I will put my fresh points in and see what effect that has next. It will be a while before I can get to it but will be sure and let everyone know how it goes. Thanks again.
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Old 05-26-2010, 06:26 AM   #26
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

opps... I didnt get the V8 part. I would look into ignition also if carb is clean.
POPPING out the exhaust = rich or a miss in the ignition
POPPING out the intake = lean
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Old 05-26-2010, 09:01 AM   #27
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

F-1 I posted this a while ago and from the details of your post it seems to be related to the same issue. I had a slight skip at higher sustained RPM and always attributed it to poor point contacts from a condenser going bad. I also experienced a slower acceleration than I thought would be adequate. In short everything ran but just not what believed up to par.

Last year I had some vapor lock issues with another car and discussed this with a fellow that worked for a big 3 auto company. The conversation centered around new formulated fuels and their effects on earlier carburetor engines.

The end result of this was the determination that the early fuel systems were designed to run on a gasoline mixture significantly different than the 10% ethanol fuels available at most gas stations now. Because of the difference in fuel molecular volume, with the addition of the ethanol derivative, the carburetor jetting must be increased to compensate for this larger molecule fuel. Using the original jetting based upon a pure gasoline fuel this would make your vehicle run on the slightly lean side. To run on new fuel you may have to increase your jet sizes by 2-4 numbers to readjust the air fuel ratio for correct performance. I did this and it made my engine run like a new car.

My position is that if you are driving any vehicle today with an older style fuel system you must increase the jet size for better performance. I also would suggest that you clean your contact points of corrosion but I believe that your engine is running slightly to the lean side, thus the skip.
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Old 05-26-2010, 12:29 PM   #28
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

You should really have your distributor tested on a machine. There could be wear in the components that allow some wobble at higher rpms. As for the jetting, I have never experienced the need for increasing with todays fuels. I just don't think there is that much difference if using only 10% ethanol. There are fuels that do not have any ethanol at all.
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Old 05-26-2010, 02:03 PM   #29
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Dick,
Thanks for the excellent insight. That's the first response that I've received that trys to explain why my stock jets may be too lean. I think you also raise a very good point in that an engine that is on the lean side will more likely missfire if something is not 100% in the ignition system. I think I will try throwing some slightly larger jets in to evaluate the effect. Where's the best place to get jets? Are they just standard Holley jets? Thanks again for the response.
Dan
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Old 05-26-2010, 02:08 PM   #30
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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You should really have your distributor tested on a machine. There could be wear in the components that allow some wobble at higher rpms. As for the jetting, I have never experienced the need for increasing with todays fuels. I just don't think there is that much difference if using only 10% ethanol. There are fuels that do not have any ethanol at all.
I absolutely will have the distributor tested this winter but I don't have a working spare and I don't want to leave the car down during all this great roadster weather. I'll evaluate the jetting issue and let you know if it helps at all.
Thanks,
Dan
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Old 05-26-2010, 02:37 PM   #31
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

F-1-- What do the plugs look like? They will tell you by looking at each plug how the mixture is. I like to see a few dark spots on the flat surface below the bottom end of the threads. If it is lean there will be no black and will be a very light tan. To rich and they will be covered with black soot. I have adjustable main jets and can tune them by looking at the plugs or with an exhaust gas anylizer. One jet could be a differant size or have dirt in it also. The front plug on each side represents the different sides of the carb that feed them. One side of the carb don't feed one side of the engine, it chriscrosses. If I recall with a steel intake the passenger jet feeds the front plug on the passenger side. The drivers side main jet feeds the front plug on the drivers side. With an aluminum intake the passenger main jet feeds the front plug on the drivers side. I may have the alum and steel backwards but you can look at the manifold and track the fuel, air "runs". In some of the Ford service bulletins there are diagrams showing the flow through the maniflod. Try the Marvel Mystery Oil to free a sticky valve before you get into "neverland. G.M.
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Old 05-26-2010, 03:01 PM   #32
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

I had a mis at higher RPM, tried jets. Replaced the condenser and solved my problem. Recomend when you do, solder a longer lead on it and re-locate it to a more accessable location. Good Luck.
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Old 05-27-2010, 06:21 AM   #33
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I had a mis at higher RPM, tried jets. Replaced the condenser and solved my problem. Recomend when you do, solder a longer lead on it and re-locate it to a more accessable location. Good Luck.
Billyg,
I bought a new 6 volt coil and matching condenser from Napa and it cleared up 75% of my problem. I made my own remote coil adapter and mounted the condenser on top of it just like the kit that is available. My coil is now mounted on the front of the firewall. It's possible that my new condenser is bad and maybe I'll try another one just to be sure.
Thanks

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Old 05-27-2010, 06:24 AM   #34
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

G.M.,
The plugs look pretty clean and lean which is what got me headed down this road. I really need to to a w.o.t, shut it down and then have a look. I'll do that and get a better reading. Thanks for the info and reminder.
Dan
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Old 05-27-2010, 11:48 AM   #35
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

F1FLATHEAD . . . . . . . . . .
I really liked your two videos on starting up and the first drive. They were very cool and fun !
MIKE
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Old 05-28-2010, 05:59 AM   #36
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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F1FLATHEAD . . . . . . . . . .
I really liked your two videos on starting up and the first drive. They were very cool and fun !
MIKE
I made that video so I could send the link to my dad 'cause I knew he would get a kick out of seeing the motor start for the first time. It's now had so many views (over 15,000) that youtube wants to pay me to show commercials with it (I declined). Can you imagine that? There's a lot of old Ford lovers out there.
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Old 05-28-2010, 06:52 AM   #37
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Running two 94's on a 53, I purchased new power valves during set up and after much trial and error found the correct value, just chucked them in my lathe and with a thin parting bit squared off the radius, that was 8 years ago works and seals perfect.
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Old 05-28-2010, 07:33 AM   #38
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

A thick gasket with give takes care of that radius, have done lots of them and no leakers. G.M.
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Old 05-30-2010, 07:30 AM   #39
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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F-1-- What do the plugs look like? They will tell you by looking at each plug how the mixture is. I like to see a few dark spots on the flat surface below the bottom end of the threads. If it is lean there will be no black and will be a very light tan. To rich and they will be covered with black soot. I have adjustable main jets and can tune them by looking at the plugs or with an exhaust gas anylizer. One jet could be a differant size or have dirt in it also. The front plug on each side represents the different sides of the carb that feed them. One side of the carb don't feed one side of the engine, it chriscrosses. If I recall with a steel intake the passenger jet feeds the front plug on the passenger side. The drivers side main jet feeds the front plug on the drivers side. With an aluminum intake the passenger main jet feeds the front plug on the drivers side. I may have the alum and steel backwards but you can look at the manifold and track the fuel, air "runs". In some of the Ford service bulletins there are diagrams showing the flow through the maniflod. Try the Marvel Mystery Oil to free a sticky valve before you get into "neverland. G.M.
G.M.,
Ran the motor hard at W.O.T. and then switched it off, coasted to a stop and pulled the front two plugs. They are very light tan to nothing at all. I would read that at as a tad too lean. I'm going shopping for a set of 53s and a set of 55s. We'll see what difference that makes.
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Old 05-30-2010, 12:27 PM   #40
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

I would read that as being just fine. It is much harder to get a good read with todays fuel. How did it run at WOT? 51's should be just right for your area.
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Old 05-30-2010, 05:54 PM   #41
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Drive it NORMALY and see what kind of gas mileage you get. G.M.
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Old 06-01-2010, 05:43 AM   #42
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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I would read that as being just fine. It is much harder to get a good read with todays fuel. How did it run at WOT? 51's should be just right for your area.
flatjack,
It sputters and missfires but inconsistently. Sometimes it pulls pretty steady and hard but other times it missfires badly and won't accelerate past 3000 rpm or so. I will still go ahead and experiment with richer jets. I don't see any reason not too.
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Old 06-06-2010, 06:09 AM   #43
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Here's an update on my issue. I bought a set of Holly #53 jets and put them in just in time to drive to the "Sins of Steel" car show yesterday. I noticed no or only slight improvement in performance with the bigger jets. Interestingly, the spark plugs look a little better now, though. They now have a more even "milk chocolate" color. Bottom line is that I still have an issue. I played with the timing on the way home, first advancing and then retarding it. Either direction made it run worse, not better. Next step will be to install new points since I also sprung a hole in my radiator and have to pull it anyway. I also want to try removing my "Helmet style" air cleaner to see what difference that makes. I read somewhere that some of those have very restrictive filter elements. That will be a simple thing to check out.
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Old 06-07-2010, 11:27 AM   #44
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Played with the car last night some. Removing the aircleaner made no difference. New points made no difference. Regapped plugs to .025 (they were more like .030), made no difference. Am going to have to continue swapping parts like rotor and dist caps and such. I hate to spend money and buy aftermarket crap. I really like to keep my old, original Ford stuff but am running out of options. If that doesn't work, I will have to pull the dist. and send it in but I hate to have the car down now. I'm having a blast driving it even though it doesn't run perfectly.
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Old 06-07-2010, 08:00 PM   #45
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Tried a different totally different distributor tonight. No difference. Tried one of my spare, known good carbs and it also made little or no difference. Next step is a new new remote coil conversion kit from speedway. I should have that Wednesday. After that, I guess I'll try distributor caps but I'm really starting to think it's sticky valves and/or weak valve springs. I need to try the Marvel Mystery oil trick that one of you suggested. If none of that works, it will be time to do a valve job.
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Old 06-07-2010, 08:18 PM   #46
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

I have been following your saga but before you go do a lot of work preparing for a valve job, do a leak down test to see if they are really the culprit. The suggestion of a little marvel mystery oil for a top lube isn't bad idea either, in fact its a good idea to run a top lube in any flathead. Since you changed the fuel mixture and this slightly improved the performance you still need to check the condition of the cap contacts and rotor especially if they are old units. A carbon track on the cap contact or some dirt floating around in the distributor will create a random skip too. While you are at it give the plug wires a look over for electrical leaks in the wire loom.
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Old 06-08-2010, 09:07 AM   #47
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

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I have been following your saga but before you go do a lot of work preparing for a valve job, do a leak down test to see if they are really the culprit. The suggestion of a little marvel mystery oil for a top lube isn't bad idea either, in fact its a good idea to run a top lube in any flathead. Since you changed the fuel mixture and this slightly improved the performance you still need to check the condition of the cap contacts and rotor especially if they are old units. A carbon track on the cap contact or some dirt floating around in the distributor will create a random skip too. While you are at it give the plug wires a look over for electrical leaks in the wire loom.
Dick,
The engine idles very smoothly and has very good compression. If the valves are hanging up, it can only be at high RPM. The plug wires are new but the distributor caps are original Ford stuff so they are definitely suspects. I have taken them off, washed them and inspected them closely but I may be missing a crack or a carbon track. Thanks for the tips.
Dan
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Old 06-14-2010, 06:55 AM   #48
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Default Re: Holly 94 jet recommendation for a flathead running open exhaust?

Decided this weekend to tear the heads off and check out the valves and springs. I cranked it over with the intake off and I could definitely see it blowing back through the intake ports on 2 of the cylinders so I at least have two valves not closing tightly. I will tear it all down, clean it up, reface the valves and seats if required, check the valves springs and replace if weak, put it all back together and report.
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