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Zeke3 · 04-17-2020, 08:24 AM

Thanks Brian, good to know it is possible to go to 3 3/16" bore on a 21 stud block. I thought the OP was thinking of using some +.125" Merc pistons, which would be 3 5/16" wouldn't they? I have no experience in that area, but it sounded too big to me.

My engine has the labyrinth rear seal in the top with nothing in the rear main cap. I was planning to get the added die cast piece for the cap and not modify the crankshaft.

04-17-2020, 08:24 AM	#15
Zeke3 Senior Member Join Date: Dec 2014 Location: Columbus, IN Posts: 1,409	Re: 24 stud crankshaft in a 21 stud engine Thanks Brian, good to know it is possible to go to 3 3/16" bore on a 21 stud block. I thought the OP was thinking of using some +.125" Merc pistons, which would be 3 5/16" wouldn't they? I have no experience in that area, but it sounded too big to me. My engine has the labyrinth rear seal in the top with nothing in the rear main cap. I was planning to get the added die cast piece for the cap and not modify the crankshaft. Last edited by Zeke3; 04-17-2020 at 08:29 AM. Reason: Added information on rear main seal.