21A rods set up on a 4" Merc crank - The Ford Barn

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21A rods set up on a 4" Merc crank

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06-27-2025, 12:13 PM	#3
Ken/Alabama Senior Member Join Date: May 2010 Location: Alabama Posts: 3,394	Re: 21A rods set up on a 4" Merc crank Big end of the rods should measure 2.220. Then measure the diameter of the crank journal then measure the thickness of the bearing at the crown and multiply by two. then with a little arithmetic you’ll find your oil clearance.

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