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Ol' Ron · 10-29-2019, 03:01 PM

Check the bores of the rods. Stock is 2.22o, which is actually alittle tight for the bearings. If your using early stock bearings that measure .109, you'll be OK. However, I usually have the rods honed to 2.221. The next thing is the width of the bearing and side clearance .008/.0010. more reduces the flow to the rods. Rod clearance should be .010/015 to allow good flow through the bearing. Total clearance between all the bearing surfaces is aprox .004.0055. I use 15/40 oil. Hi pressure oil has a tendency to flake the Cad/silver bearings. and the Copper bearings will last along time with these clearances.
THis is a street/competition setup Good luck
Now,I may have some numbers wrong, so some of you builders ma question them. Please do.

10-29-2019, 03:01 PM	#3
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: 21A rods Check the bores of the rods. Stock is 2.22o, which is actually alittle tight for the bearings. If your using early stock bearings that measure .109, you'll be OK. However, I usually have the rods honed to 2.221. The next thing is the width of the bearing and side clearance .008/.0010. more reduces the flow to the rods. Rod clearance should be .010/015 to allow good flow through the bearing. Total clearance between all the bearing surfaces is aprox .004.0055. I use 15/40 oil. Hi pressure oil has a tendency to flake the Cad/silver bearings. and the Copper bearings will last along time with these clearances. THis is a street/competition setup Good luck Now,I may have some numbers wrong, so some of you builders ma question them. Please do.