Brand new SRP Forged pistons for big Chevy 4.310” bore 1.270” C/H 18cc dome For use with 6.385” rods and 4.250” stroke (496ci) in a short deck block (9.800”) Pn: 212157-8 compete with pins, oil ring support rails and spiro-locks. ~10-11:1 C/R depending on head CC Never installed, going with a blower, ordered lower compression pistons. Firm price, they’re brand new in the box. Cash sale, local pick up only, no East Indian scammers/shipping or questionable links for payment! Too many of those from this site already.