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tubman · 01-17-2021, 11:19 AM

I'm with "Ol' Ron" in liking a 258 ci flathead (3 5/16" X 3 3/4"). Three more cubic inches than a 4 inch Merc crank will give you with a stock bore for a lot less money. (Lower piston speeds, too; not that it makes much difference with a flathead.)

01-17-2021, 11:19 AM	#23
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,321	Re: 266 versus 276 CI? I'm with "Ol' Ron" in liking a 258 ci flathead (3 5/16" X 3 3/4"). Three more cubic inches than a 4 inch Merc crank will give you with a stock bore for a lot less money. (Lower piston speeds, too; not that it makes much difference with a flathead.)