Sealed Power R9902-20 Plasma Moly Piston Ring Set 4.020" Bore

The Sealed Power R9902-20 is a premium Speed Pro plasma moly piston ring set designed for 8-cylinder engines with a 4.020 inch bore diameter. This complete kit includes rings for all eight cylinders and features advanced construction materials and coatings for superior performance and durability.

Key Features:

• 4.020 inch bore diameter for 0.020 inch oversize applications
• Ring thickness configuration: 1/16" top ring, 1/16" second ring, 3/16" oil ring
• Plasma moly coated barrel-shaped ductile iron top rings for instant seating and long service life
• Standard tension design for drop-in installation
• Tapered secondary compression rings for excellent oil control
• 3-piece oil rings with stainless steel expanders for proper tension without robbing horsepower
• Ductile iron construction provides superior strength and durability
• Complete 8-cylinder kit with matched ring sets

Speed Pro piston rings are engineered to withstand the rigors of racing and high-performance street use while delivering exceptional sealing against blowby and providing long service life. The plasma moly facing on the top rings ensures quick break-in and optimal cylinder wall sealing even when pistons rock in the bore.