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Ol' Ron · 08-05-2019, 06:46 PM

The 40 engine comes in two sizes 3 1/16 and 3 3/16. The crank, rods and pistons will drop right in. The 221 block must be bored an 1/8 to fit the rods. Or the crank turned to 1.998 for the floater's. However, if you select to bore, better off using a later block and make 276. I've found that a "STOCK" 276 with EAB heads milled for .045 piston clearance, is a toque monster.

08-05-2019, 06:46 PM	#4
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,873	Re: 1CM Merc Crank In A 40? The 40 engine comes in two sizes 3 1/16 and 3 3/16. The crank, rods and pistons will drop right in. The 221 block must be bored an 1/8 to fit the rods. Or the crank turned to 1.998 for the floater's. However, if you select to bore, better off using a later block and make 276. I've found that a "STOCK" 276 with EAB heads milled for .045 piston clearance, is a toque monster.