The Ford Barn

Fibber Mcgee · 04-23-2017, 08:35 AM

Does any have a chart showing the combustion chamber size in different stock Flathead heads? I've seen so many contradictory information on here and other sites. Are EAB, 8BA and 8RT the same or different? Has anyone checked the volume? Thanks.

Binx · 04-23-2017, 12:07 PM

look at the second post of this thread...

http://www.jalopyjournal.com/forum/t...hoices.482189/

Lonnie

Ol' Ron · 04-23-2017, 12:53 PM

Many of us have, and their all over the place. I do find EAB heads to be very consistent.

JSeery · 04-23-2017, 06:06 PM

"once and for all"

LOL, if you notice the same questions appear (on about every topic, not just heads) at least several times a month! Good luck with "once and for all".

Fibber Mcgee · 04-23-2017, 07:03 PM

Quote:

Originally Posted by Ol' Ron

Many of us have, and their all over the place. I do find EAB heads to be very consistent.

Maybe they are just that inconsistent, I've heard 8RT and EAB are different but a while back I got a syringe and measured the two and they were almost identical volume wise.

tubman · 04-23-2017, 08:33 PM

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I think your last post just answered your question. At this late date, the only way to be sure of anything is to actually measure them yourself. It ain't that hard. I have two sets of Edmunds heads that, while they look identical, have chambers that are over 10 cc's different. One set (at least) had been milled at one time.

JSeery · 04-23-2017, 09:21 PM

Quote:

Originally Posted by Fibber Mcgee

Maybe they are just that inconsistent, I've heard 8RT and EAB are different but a while back I got a syringe and measured the two and they were almost identical volume wise.

You would need to know if the heads had ever been surfaced or milled. To make a comparison you would need to check several of each style. Very few of these engines have not been rebuilt at least once and most of them several times.

meric42 · 04-23-2017, 09:49 PM

This might help.

Newc · 04-23-2017, 10:39 PM

Hi all; My 'quick' Swap meet check is to measure the diameter of the compression dome in the heads. Should be close to a stock eng bore 3 3/16/ or 3 5/ 16" Milling shows up quickly. Lost of mismatched 'Pairs" Newc

04-23-2017, 08:35 AM	#1
Fibber Mcgee Senior Member Join Date: Oct 2010 Location: Callahan Fla Posts: 1,149	Head difference ,once and for all. Does any have a chart showing the combustion chamber size in different stock Flathead heads? I've seen so many contradictory information on here and other sites. Are EAB, 8BA and 8RT the same or different? Has anyone checked the volume? Thanks. __________________ Wanted, a car with a " Dynaflex Superflowing Unijet Turbovasculator which is Syncromeshed to the Multicoil Hydrotensioned Dual vacuum Dynomometer. "

04-23-2017, 12:07 PM	#2
Binx Senior Member Join Date: Oct 2011 Location: Gloucester VA Posts: 1,042	Re: Head difference ,once and for all. look at the second post of this thread... http://www.jalopyjournal.com/forum/t...hoices.482189/ Lonnie

04-23-2017, 12:53 PM	#3
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,855	Re: Head difference ,once and for all. Many of us have, and their all over the place. I do find EAB heads to be very consistent.

04-23-2017, 06:06 PM	#4
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: Head difference ,once and for all. "once and for all" LOL, if you notice the same questions appear (on about every topic, not just heads) at least several times a month! Good luck with "once and for all".

04-23-2017, 08:33 PM	#6
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,303	Re: Head difference ,once and for all. Sponsored Links (Register now to hide all advertisements) I think your last post just answered your question. At this late date, the only way to be sure of anything is to actually measure them yourself. It ain't that hard. I have two sets of Edmunds heads that, while they look identical, have chambers that are over 10 cc's different. One set (at least) had been milled at one time.

04-23-2017, 10:39 PM	#9
Newc Senior Member Join Date: May 2010 Posts: 2,482	Re: Head difference ,once and for all. Hi all; My 'quick' Swap meet check is to measure the diameter of the compression dome in the heads. Should be close to a stock eng bore 3 3/16/ or 3 5/ 16" Milling shows up quickly. Lost of mismatched 'Pairs" Newc