Revolution Performance Monster Big Bore Piston Kit (139in. Dished) - Bore 4.50in. - Stroke 4.375in. - 10.5:1 Compression - 301-600W

Top-quality piston kit featuring superior ring seal, bore compatibility, quiet running and longer lifespan
2,000 hours of durability testing behind every piston
Auto-Fit Coating is a permanently bonded, moly-based coating process, designed to last for the life of the piston
Accurate to a 30 micron thickness to deliver tight piston-to-sidewall clearances for ultra-quiet operation
Gas nitride-coated rings offer the ultimate compatibility with nickel-silicon-carbide-plated bores
Replacement piston rings are available separately (sold as a set for one piston)
Made in the U.S.A.