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Can someone explain to me the entire idea behind knurling the skirts and how it works?



Its a thing where you use a knurl tool to raise material on the surface of the piston skirt to reduce clearance/slap. A knurl looks like the criss cross finish you see onthe handle of cheap tools, like made in china ratchets.

It's a technique developed to reuse old parts when new ones are scarce, or too expensive.

Not worth the time on a re ring in a hobby car
A piston that needs a knurl likely needs ring land spacers, etc.., so in reality it needs pistons


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What have you guys found on engines you've rerung and how did it turn out? Im just worried im going to put this together and have it run like a low compression turd with 100 psi of cranking compression. My last 440 was VERY tight and I think I may have been spoiled with it, I want this one to run the same but not so confident it will.



My last rering has been a little iffy, but the two before that were great. Good compression, good power, no oil consumption.

It's a low dollar crap shoot. Odds are in your favor if you do it right. The finish on hone will make or break the job.

Back in the day it was a very common thing to do.