Piston Rings, Cast vs Moly

[Steven G.]

What type of factory piston ring was used on 8:5-1 piston on a 72' base engine ? other discussion about H/P engine rings when using a moly type ring or not would be welcome! Steve

[John H.]

Re: Piston Rings, Cast vs Moly

What type of factory piston ring was used on 8:5-1 piston on a 72' base engine ? other discussion about H/P engine rings when using a moly type ring or not would be welcome! Steve

Steve -

ALL piston rings are cast iron; in the 60's, the faces were chrome, and they took a long time to seat. All rings these days are still cast iron, but they're moly-faced, require specific honing, and they seat literally in minutes.

Don't even THINK about using old-style chrome rings.

[Joe L.]

Re: Piston Rings, Cast vs Moly

What type of factory piston ring was used on 8:5-1 piston on a 72' base engine ? other discussion about H/P engine rings when using a moly type ring or not would be welcome! Steve

Steve-----


For 1972 the top compression ring was cast iron, moly-filled. The second ring was plain cast iron. The oil control ring was chrome-plated steel side rails with a stainless steel expander ring.