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Old 02-19-2021, 01:03 PM   #3
Bored&Stroked
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Join Date: Jan 2011
Location: Central Ohio
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Default Re: C59A bearings questions

Since the crank has dual oil-holes, you should be fine running the later rods and insert bearings (assuming the journal sizes match). I've not ran a C59A crank - so I'm a bit out on a limb.

Make sure you consider the journal conditions and bearing clearances. Have the crank checked out first to see whether or not it needs a regrind.

Don't have it reground until AFTER you've had the rods reconditioned and have the new undersize bearings in your hand. The same goes for the mains - I typically buy the next undersize main bearings and take the block and new bearings to the machinist before I allow them to regrind the crank. It is important to install the bearings and determine the clearances - before grinding the crank (in my opinion).

Have the machinist grind the crank to match your specific rods and bearings - that way you'll get exactly the right clearances you need. I'd go for about .00175 to .002 rod journal clearance for a street engine. On the mains - shoot for .002 to .0025.
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