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rotorwrench · 09-04-2018, 05:43 PM

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.

09-04-2018, 05:43 PM	#3
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	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.