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Old 06-29-2014, 07:50 PM   #4
flatheadkid1
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Join Date: Oct 2013
Location: Ohio
Posts: 50
Default Re: Merc crank in 36LB block

A source told me that the 4" Merc. journals need to be ground to accept the 21A/91A connecting rods. I read on the barn somewhere that 8BA rods can be used in 37 and later 3-1/16" bore engines by installing the pistons before installing the crank but I'm not sure that will work with the 36LB block.
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