Hastings "Tough Guy" Claimer Series Racing Piston Ring Set - Bore Size: 4.030" Top Ring: 1/16", Second Ring: 1/16", Oil Ring: 1/8" - Plasma Moly Top Ring R07C15YL Ideal for installing single springs

Ideal for installing single springs on GM Vortec head

Like all Flowmaster products the benefits include improved throttle response

Eliminates OE By-Pass & Bolts to the Mounting Holes Inside Oil Filter Pocket

coil-over springs to increase effective spring rate

Hastings "Tough Guy" Claimer Series Racing Piston Ring Set - Bore Size: 4.030" Top Ring: 1/16", Second Ring: 1/16", Oil Ring: 1/8" - Plasma Moly Top Ring R07C15YL Ideal for installing single springsAffordable and designed to deliver exceptional performance, piston ring sets include choice of plasma moly or phosphate coated cast iron top rings, reverse twist cast iron second rings, and patented Flex Vent, standard tension oil control rings. Sold in eight cylinder sets. Features: Claimer Cast (C) Series includes top rings made of proprietary shell mold cast iron, phosphate coated, with a torsional top ring. Advantages of cast iron rings include: