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Old 04-05-2017, 10:04 AM   #1
Mike Mayer
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Default heads

I am gathering parts for my next rebuild . At this time I have 3 sets of cast iron heads . this it a 8ba motor .I have a set of 8cm ,8ba and EAB heads . I need some advise . what set of heads will give me an edge or are they all the same? please advise!
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Old 04-05-2017, 10:23 AM   #2
Scotty's 52 F3
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Default Re: heads

EAB is supposed to be the highest compression stock head.
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Old 04-05-2017, 10:26 AM   #3
rotorwrench
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Default Re: heads

EAB are a slight improvement over the 8BA but they are close. The 8CM ones have chambers that are a fair amount larger so they are more like 8RT truck heads.
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Old 04-05-2017, 10:37 AM   #4
51504bat
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Default Re: heads

Don't use the 8cm heads unless you are running a 4" crank. I'm running EAB heads on the 8ba in my '39 p/u and I'm happy with them FWIW.
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Old 04-05-2017, 10:47 AM   #5
Mike Mayer
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Default Re: heads

Thank you all for your help Semper Fi
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Old 04-05-2017, 08:48 PM   #6
WestCoast
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52 and 53 b2and 3 heads have the higest compression, 7.2, the ret have 6.8, 52 53 merc heads run 7.2. , 1cm heads 6.8
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Old 04-06-2017, 09:46 AM   #7
Ol' Ron
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Default Re: heads

Now if your going to use a hi lift cam like the L-100, the head will have to be clearanced . Also, regardless of the head you use the piston to head clearance should be .045/.050" to increase the turbulence in the chamber. This will improve throttle response and economy.. Just remember there's a reason why you do things and some of the choices have an affect on other things. There's a differance between building an engine and putting one together.
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Old 04-06-2017, 02:26 PM   #8
Mike Mayer
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Default Re: heads

thank You Ol' Ron I will take your advice to heart . I do have a l-100 cam and a merc crank with .030 over pistons.
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