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I have a low mileage lm7, im pretty sure he said it was around 8k miles on it. I was reading it is important to open up the ring gap on lower mileage motors. But I was wondering how big of a gap? Thanks for any help
From what I understood you do not want to gap both rings to the same size as it creates flutter. Dont quote me on this but I believe the top ring should be gapped up to 0.025 and the bottom ring can be gapped a bit more. I wouldnt hold me to that but there are threads on here with real world data.
Last edited by 2muchboostNY; Oct 15, 2014 at 09:58 AM.
I read somewhere forged pistons can handle slightly tighter gaps .006 x bore. compared to hypereutectic pistons .0065 x bore. Anyone ever hear of this before ?
so a .024 gap for the top and stock bottom would be a safe route?
Not really. You want the bottom gapped wider than the top. (from what i read anyway) If you went .024 on top go .026 bottom. Though as many have proved doing otherwise isn't going to cause major issues.
I never re-gap rings....
I always put on new ones, and you set it by the manufacturer recommendations... every brand of rings has their own specs that they want to see for optimum performance and life.
its is always based on Bore size and type of power(NA/N20/FI)
The rings in your engine are now perfectly worn to the bore.
First thing you need to do is disassemble it and measure the gaps.
Mine had 126k. The tops were .019" and the second was .028".
I opened the top to .024" to .025". I left the second alone.
The bottom ring is the oil ring. Leave them alone.
BTW, from everything I've read, the stock rings are excellent. Hard to beat them going aftermarket. They are also quite expensive to buy from GM. Another reason to re-use them.
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Ring gap? 
