ID different heads
 

I found these heads. 2 different engines and each engine seemed to have a Canadian and American head installed.
What is a EABF head? I’m assuming it is American made head.
Thanks

Re: ID different heads
 

The EAB heads heads have the highest compression for stock heads. The Merc head is alower CR about the same as the8BS head. I haven't any info on the other head, be nice to see the combustion chamer.
Gramps

Re: ID different heads
 

This is the green heads. Strange dimple in front of 1 and 4 spark plug hole. None in front of 2&3

Re: ID different heads
 

This is the EAB heads. Using the unscientific finger feel they seem very similar
I’ve seen other eab heads with other letters cast next to the eab

Re: ID different heads
 

It seems US heads usually have the ford logo
This is from the Hamb

Re: ID different heads
 

Neat

Re: ID different heads
 

The last EAB heads in my book were the EAB-6049-C as of January 1953. Same for the other head EAB-6050-C. I have no idea what that F at the end designates. 8CM is common 49 through early 51 Mercury. The C8BA is a Canadian 8BA head. Canada put C in a lot of prefixes since they had their own foundry across the Detroit river at Windsor, Ontario.

Re: ID different heads
 

What about the little block in front of the spark plug on the 8cm head. Only on 1&4 cylinder?

The dimples are on what I would say is an American head with the mercury script logo. I’m surprised nobody has seen this before.

Re: ID different heads
 

None of my 8CM heads have that. If it was a spark plug shroud or intentional to the casting then all four clearance volumes should be the same. I would grind them off if using them on a stock Mercury. The Merc heads have lower compression than 8BA and EAB heads to keep the compression ratio similar for the larger cubic inch 255 engines.

Re: ID different heads
 

Here's an "off the wall" guess : maybe the "C" stands for "Compressor" instead of "Canada". They made some that ran on 4 and pumped on 4.

Re: ID different heads
 

I have no use for them, wall hangers mismatched heads.