502nova3

Just wornding what piston ring material would be best for me the engine is a gen iv bbc with a 4.530 bore and dart iron eagle heads. Most cylinders are and pretty good shape but a few have minor scuffs and I don't have the tools for measuring out of round nit going to a machine shop as where I live in canada they are way over priced as there's very few so I ordered cast rings because of this but they accidentally sent moly ones and I heard u want a 100% perfect finish for moly rings am I best to send em back and get cast? That and I already Honed it at 220 or 240 grit

These are the rings they sent me Piston Rings, Premium Ductile Ring Sets, Plasma-moly, 1/16 in., 1/16 in., 3/16 in. Thickness, 8-cylinder, Set of 8

underpsi68

You have a 4.530 bore and 4.500 rings? Not going to work well.

502nova3

I gnore that thats just same ones I got but in std bore I got .035 over gonna file fit em just grabbed that off the intenet just wondering if my cyl may not have the proper finish if im better going with the cast ones that I wanted

snapmorgan

I don't think it will make any difference. If moly rings won't seal, cast ones won't either.

502nova3

Ya I just heard that cast is better if u have an questionable cyl that and I used a 220 grit hone heard the moly ones like a lot smother finish any truth to that ?

underpsi68

Moly rings should seal very quick. I believe the moly is over a cast ring.

502nova3

ya it says first ring Ductile iron second ring just iron but ya I have one cyl with Slight score and and like i say already Honed it with 220 I heard moly likes a smooth finish just wondering if honing it at 220 will affect anything mostly

boostbros

call total seal they are very good they have me running a gap less in a big blown application told me no filled rings as boost will knock the coatings or fillers out watch the end gaps we are running 34 to 35 thou end gap

underpsi68

This is Total Seals instructions


I ran moly top ring with 9:1 compression and 30lbs of boost with no issues. You just have to make sure you don't have detonation or it will knock the moly coating off.