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Ol' Ron · 04-23-2016, 02:49 PM

When you say Merc engine, does it have the 4" crank? If just for resale, that may be a buyer option the EAB heads would be best as ther have more compression. The ECM and 8RT are the lowest compression, having alarger combustion chamber. However High compression, depending on bore size would still be less then 8:1, even with .050" piston to head clearance.

04-23-2016, 02:49 PM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,985	Re: Merc stock heads vs. EAB to use When you say Merc engine, does it have the 4" crank? If just for resale, that may be a buyer option the EAB heads would be best as ther have more compression. The ECM and 8RT are the lowest compression, having alarger combustion chamber. However High compression, depending on bore size would still be less then 8:1, even with .050" piston to head clearance.