How much piston clearance when boring

8850dave · Mar 27, 2017

How much cylinder to piston clearance do I need when boring a late JD A block to .045 over with original JD cast pistons

Mike(NEOhio) · Mar 27, 2017

I think you bore .003 to .004 under what it should finish to and hone till you get the proper clearance to the piston. Others here more knowledgeable may have something to add.

teddy52food · Mar 27, 2017

Bore it .045 . The clearance should be in the pistons. For aluminum I go an extra 3 or 4 thousands.

Waterloo · Mar 29, 2017

With aftermarket aluminum pistons the clearance should be 0.012 to 0.015 over. My supplier had several cases when the original specs for cast pistons of 0.08 to 0.010 was used and the engine locked down after warming up. I use 0.015 over on all engine rebuilds with aluminum pistons.

How much piston clearance when boring

8850dave

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Mike(NEOhio)

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teddy52food

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Waterloo

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