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Old 09-04-2018, 04:00 PM   #1
ron hebb
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Default mercury engine

1953 mercury engine 4 inch crank wondering what would be the right heads or the numbers on the heads




any help would be appreciated
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Old 09-04-2018, 04:21 PM   #2
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Default Re: mercury engine

Original heads have "EAC" cast near the center. If you have "EAB" heads, all the better. They give more compression and were a common swap back in the day.
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Old 09-04-2018, 05:43 PM   #3
rotorwrench
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Default Re: mercury engine

EAC heads should also have the Mercury name on them. EAB are Ford types but they do have a higher CR for the 239 CID. This makes them even higher CR for the 255 CID Merc engines. The EAC would be OEM on a Mercury if that's the way you want it.
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Old 09-05-2018, 09:20 AM   #4
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Default Re: mercury engine

I have seen "8CM" stamped on Mercury heads. Not sure which year.
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Old 09-05-2018, 10:36 AM   #5
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Default Re: mercury engine

1949-1950 and some 1951. I believe some 1951 can have "1CM".
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Old 09-05-2018, 06:55 PM   #6
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Default Re: mercury engine

My wife's barn truck, the '34 pickup, has a Mercury engine with an EAC head on one side and 8BA on the other. Smoothest running flathead I ever owned!
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Old 09-06-2018, 02:36 AM   #7
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Default Re: mercury engine

Quote:
Originally Posted by drolston View Post
My wife's barn truck, the '34 pickup, has a Mercury engine with an EAC head on one side and 8BA on the other. Smoothest running flathead I ever owned!
So, how do you know it's a Mercury engine??
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Old 09-06-2018, 01:25 PM   #8
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Default Re: mercury engine

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Originally Posted by 34PKUP View Post
So, how do you know it's a Mercury engine??
I believe the shop that built the truck for the seller that the engine is Mercury. It does have the 4" stroke. Is there something else on the block I could check to verify Mercury versus Ford. Not that it matters on our barn truck.
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Old 09-06-2018, 06:36 PM   #9
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Default Re: mercury engine

All USA cast 8BA blocks are pretty much the same with only a few exceptions. Valves changed to rotator type in mid 1951 and exhaust valve seats were the only ones with hardened inserts. The casting for late 1951 had 1BA casting mark down in the intake valley. Later in 52 or so, they did away with the valve seat inserts for car engines. Only the truck blocks continued to have the hardened exhaust seats.

The only difference between the Ford and the Mercury internal moving parts was the crankshaft, cam, and the pistons. Everything else was the same. When you change to the 4" crank, 1 of 2 different cam shafts, & use the pistons for 4", then you have a 255 CID Mercury short block. A person would have to use the oil pan, heads, intake manifold and maybe the front timing cover to have a built up Mercury engine long block.
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