8ba Head Replacement

[F-ONE]

Originally Posted by tubman

"EAC"'s ('52-'53 Mercury heads) have larger chambers than "EAB" ('52-'53 Ford heads) and are not as good a choice. FMC did this to keep the compression ratios consistent between the Fords and the Merc's (that had a longer stroke). I believe the "EAC"'s are equivalent to "8BA"'s.

Of course, they can always be milled to get more compression. If you are going to go to that extent to improve the performance of your engine, you may want to get the "quench" of the combustion chamber down to a little less than 050". In my opinion, this is one of the best (and cheapest) things you can do to improve the performance of a flathead Ford. There are a lot of threads on here about the required process.

Tubman I believe the EACs are just a step below the 8BAs being roughly equivalent to the 8RT truck heads.