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04-26-2021, 07:21 PM | #21 |
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Location: San Antonio, Texas
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Re: Are these EAB heads OK?
Make sure you consider the gaskets that you plan on using. Folks get creative with gasket thickness when using copper.
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11-03-2021, 07:17 PM | #22 | |
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Location: Paris, Tennessee
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Re: Are these EAB heads OK?
Quote:
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11-04-2021, 09:45 AM | #23 |
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Re: Are these EAB heads OK?
That would be corrective for a set that is milled a little too close to the valves and in need of a little more dome area added back. Most machine shops carry enough equipment to do stuff like that if needed. It may not be needed depending on the piston clearance and cam shaft that a person wants to use. A lot depends on the condition of the heads too.
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11-04-2021, 10:09 AM | #24 |
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Location: Coral Springs FL
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Re: Are these EAB heads OK?
Ken, Can you please post more photos of your flathead engine showing your ignition system? What type of ignition system are you using? Looks unique. Thanks.
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11-04-2021, 03:57 PM | #25 |
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Location: ohio
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Re: Are these EAB heads OK?
On the head subject, I had an 8ba with 8cm cam & 8cm heads. It also had domed pistons. It needed rebuilt so I put Offy heads, flat top pistons & an IskyMax 1 in it. Performance wise, it ran better with the 8cm heads & domed pistons. Would the domed tops make up for the lower compression 8cm heads ??? Just say'n ....
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11-04-2021, 04:35 PM | #26 |
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Re: Are these EAB heads OK?
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11-04-2021, 05:05 PM | #27 |
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Re: Are these EAB heads OK?
I’ve got a couple oddball rights if you end up needing one .......Mark
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11-04-2021, 05:07 PM | #28 |
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Re: Are these EAB heads OK?
Regarding the heads, that engine is not yet assembled yet but I ended up using the right side head from the pair pictured above. My machine shop took off 0.015-0.020 (not angle milled) to clean up the gasket surface which brought the combustion chambers into the 67-70cc range. I plan to get them all in the 69-70cc range for this 276ci motor. I'm not sure if these heads had been cut before, but even with this light cut I had less than 0.040" clearance over the pistons and hand to do some grinding. See here:
https://www.fordbarn.com/forum/showthread.php?t=302368 The ignition system is part of my home-built EFI system using Megasquirt. It uses a trigger wheel which I brazed to the crank pulley and an EDIS ignition module from a 90s V8 Ford. The coil packs are GM which have the advantage of using a more standard ignition wire boot. I put a bunch of miles on everything this summer and am really happy with it! A772FC73-578C-4782-9812-EC4AD0352756 by kenhenry_06268, on Flickr Last edited by Ken Henry; 11-04-2021 at 05:31 PM. |
11-04-2021, 05:33 PM | #29 |
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Re: Are these EAB heads OK?
Thanks Mark, appreciate it. I'm all set and have amassed quite a collection of EAB heads at this point!
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11-04-2021, 05:39 PM | #30 |
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Re: Are these EAB heads OK?
In my experience, combustion chamber volume is not important, What you need is proper "squish" (.040"-.050") and the compression ratio will follow. After years of just bolting on a set of "High compression" heads and being disappointed I have found that getting the quench right is the best thing you can do with a flathead Ford.
I also do not understand the advantage on "Angle Milling", but I'm sure someone will come on here to explain it to me. |
11-04-2021, 07:18 PM | #31 |
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Location: Central Ohio
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Re: Are these EAB heads OK?
The "advantage" of angle milling is that you're taking away more material on the cylinder bore side of the head - than the valve side. It is one way to help "tune the cat".
Given that I rework my chambers (via CNC milling), valve clearances, piston compression height, etc. - it does not come into play for me. I get the clearances I want, the CR I want, etc - by the work (and parts) in my builds. BUT - I'm putting a lot of time and $$$ to do so. Ole' Ron has some good suggestions for tightening up the chambers and leaving a bit more over the valves - by angle milling. |
11-04-2021, 10:27 PM | #32 |
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Re: Are these EAB heads OK?
Sometimes you just want to rebuild your engine for a Dailey driver. Something with some reasonable power and economy without reducing your retirement funds. The 239 engine in stock form in perfect running condition produces "LESS THAN" 80 horsepower. Adding heads intakes and exhaust to it will not increase the power to 100HP and cost a bundle. Buy building a 258 HI compression stock cam engine you can have a nice runnning engine with more than 100 hP and economy and longevity as well.
Gramps Never thought I'd ever be running a stock cam, but the low and midrange torque in=s incredible, Running a 87F15 3spd with OD 3.73 rear with posy. The truck will climb any hill in Vermont in OD |
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