Piston ring material

Just wondering what piston ring material would be the most suitable for my engine. It is a Gen IV BBC with a 4.530 bore and Dart Iron Eagle heads. Most cylinder walls are in fairly good condition, although a few exhibit minor scuffs. Lacking the necessary tools to measure for out-of-roundness and not wishing to visit a machine shop due to exorbitant prices in Canada, I opted for cast rings. However, I mistakenly received moly rings instead. I have heard that achieving a flawless surface finish is crucial when using moly rings. Should I return them and stick with the cast ones, considering I already honed the cylinders at either 220 or 240 grit?
The rings sent to me are:

Piston Rings, Premium Ductile Ring Sets, Plasma-moly, 1/16 in., 1/16 in., 3/16 in. Thickness, 8-cylinder, Set of 8

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Last edited by 502nova3; 06-11- at

04:10 PM

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Post by Eagle » Sat Jan 28, 3:49 am

Dear Nate,
Dear Dcal,
Dear Modok,
Dear engineguyBill,

I truly appreciate all your responses. It has become exceedingly clear to me now.
If I am using any forged brand (which I do use for competition engines), they usually come equipped with NPR or NPR type nitrided steel rings. From what you've shared, I gather that as long as I ensure proper honing, the cylinder material—be it plain or ductile iron sleeved—should not pose a problem. This brings me relief as I felt I was on the right track.
The more challenging aspect for me was selecting cast pistons with substantially thick ring combinations. Now, I comprehend that if a Moly faced ring option exists, I should lean towards using that instead of plain or ductile iron rings. Chrome faced rings are best avoided for my specific builds.
Additionally, if I grasped this correctly, I should preferably opt for the thinnest possible ring combination on the cast pistons as well. It appears that many aftermarket cast piston manufacturers are now modifying their designs to accommodate thinner rings than what was originally available. Sourcing such pistons for my application would undoubtedly be advantageous.
Once again, I sincerely thank you all.
Best regards,
Kerem

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