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Mike Mayer 04-05-2017 10:04 AM

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!

Scotty's 52 F3 04-05-2017 10:23 AM

Re: heads
 

EAB is supposed to be the highest compression stock head.

rotorwrench 04-05-2017 10:26 AM

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.

51504bat 04-05-2017 10:37 AM

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.

Mike Mayer 04-05-2017 10:47 AM

Re: heads
 

Thank you all for your help Semper Fi

WestCoast 04-05-2017 08:48 PM

Re: heads
 

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

Ol' Ron 04-06-2017 09:46 AM

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.

Mike Mayer 04-06-2017 02:26 PM

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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