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08-02-2015, 02:08 PM | #1 |
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Flathead intake manifold recomendations
In the process of having a 39-41 Merc flattie overhauled for a 32 pickup. Specs as follows; |
08-02-2015, 04:21 PM | #2 |
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Re: Flathead intake manifold recomendations
I think the 77B cam is a major wast of money, as it's not much better than a stock cam.
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08-02-2015, 04:29 PM | #3 |
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Re: Flathead intake manifold recomendations
If You use an Offenhauser Regular intake for 2 97's, a generator with a pulley mount fan will fit without much 'fart'n' around.
OL' RON is right, IMO a Max 1 is a good street cam. There will be a thousand opinions about this. |
08-02-2015, 04:33 PM | #4 | |
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Re: Flathead intake manifold recomendations
Quote:
I realize that there will be a thousand opinions but from your posts that I have read, respect your advise. Not needing a race motor and really had no intent of balancing at this point but that could change as well. |
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08-02-2015, 05:01 PM | #5 |
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Re: Flathead intake manifold recomendations
With your bore and stroke, an L100 sounds like a good option. And the guy that grinds them is here on the Barn.
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08-08-2015, 05:38 PM | #6 |
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Re: Flathead intake manifold recomendations
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3/4" may not be anything on a F1 truck but in a 32 Ford with a 17" wide radiator, it can be a big deal, as it was with mine. A 17" wide radiator with a fabricated fan shroud along with the largest diameter fan I can fit just wasnt going to work with a 3/4" offset to the left. My solution was to re engineer the generator mount to the center of the manifold. It was a lot of work to fabricate. Bill
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08-08-2015, 06:37 PM | #7 | |
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Re: Flathead intake manifold recomendations
Quote:
I am running an Offy 4 bbl. manifold and it has the same? 7/8" offset which caused interference with my fan/shroud. I fabricated an offset pulley/fan mount to compensate.
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08-08-2015, 08:45 PM | #8 |
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Re: Flathead intake manifold recomendations
I had a whole thread a couple of weeks ago about cam selection on a 258" (for a light car) and a 276" for a heavier car. Other than the guy who grinds the "Kiwi L100's", nobody had any suggestions on a good street cam for a close to stock motor on the street. Looks to me like a Merc cam, (If you can find one), is the best choice for a street motor. If you don't already have it, buy "JWL"'s book and look at the torque figures he got from an Isky Max-1 (oh yeah, I already own one.). Looks like a waste of money to me; and if "Ol' Ron" says a "77B" is worse, I'd run real fast from that one.
Antybody want to enter into this discussion? |
08-08-2015, 09:18 PM | #9 |
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Re: Flathead intake manifold recomendations
Stock cam, one carb. Nice and smooth, nice power and never did an engine idle like that. If you want to go really fast, drive your wife's camry.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
08-09-2015, 07:32 AM | #10 | |
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Re: Flathead intake manifold recomendations
Quote:
I would recomand that you also balance your rotating assembly . Have fun ! Cheers Tony |
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08-09-2015, 09:44 AM | #11 |
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Re: Flathead intake manifold recomendations
Since I started this thread, I researched the death out of the 39-41 Merc and have switched blocks to a C69A 46 Ford. It will be opened up to 3 5/16 with a 4" Merc crank. Pistons will be Ross 3 ring and Manley stainless valves. Cam will be the L-100 which I have read lots of good reviews about. Rotating assembly will be balanced as well. A long way off my original intent which I have digressed from. I appreciate the help to date and still looking for thoughts on a manifold for the change in engine.
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08-09-2015, 10:22 AM | #12 |
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Re: Flathead intake manifold recomendations
I am real happy with my new Edelbrock "Super" dual manifold. The design of this one puts the carbs directly over the ports. You will need an offset bracket for the generator. Cost about $250 ?
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08-09-2015, 12:46 PM | #13 |
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Re: Flathead intake manifold recomendations
HB32, why would you use Ross racing pistons in a street engine? Granted, their probably the best racing piston available. However they require excessive piston to wall clearance. Egge, makes a light weight piston that can be fir tight and has a modern ring stack. Back to alittle more research.
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08-09-2015, 01:14 PM | #14 | |
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Re: Flathead intake manifold recomendations
Quote:
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08-09-2015, 02:25 PM | #15 |
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Re: Flathead intake manifold recomendations
51Merc-Ct; Nice job on fixing that fan pulley offset problem. I would like to know more about how you modified the stock fan carrier bracket. If possible, could could explain further with a sketch or photos. Did you cut and reweld the bracket? Did you use nickel welding rod? Any additional info. is appreciated. Thanks, JIM
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08-09-2015, 04:26 PM | #16 | |
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Re: Flathead intake manifold recomendations
Quote:
After cutting the basic shape using a bandsaw and drill press the round bar and gusset were welded to it and then normalized. Then it went to a machinist to bore the press fit hole for the pulley shaft.
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08-09-2015, 05:06 PM | #17 |
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Re: Flathead intake manifold recomendations
Guess I'm lazy. I moved my fan shroud over 7/8". Worked great.
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08-09-2015, 05:30 PM | #18 |
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Re: Flathead intake manifold recomendations
Pete, I didn't know that. Will have to check. We run .004/.005 clearance and 180 stats to tighten up the race pistons for street. I assume their street pistons are high on silicon? How tight can you run them I run the Egge pistons at.oo2
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08-09-2015, 05:53 PM | #19 | |
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Re: Flathead intake manifold recomendations
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I have never used the street type. |
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08-09-2015, 06:49 PM | #20 | |
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Re: Flathead intake manifold recomendations
Quote:
If I recall, using a torque plate during honing tightened up some of the clearance. Last edited by Tim Ayers; 08-09-2015 at 06:58 PM. |
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