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Speed Pro Economy Piston Rings 4.060" Bore 5/64 x 5/64 x 3/16" Thick Standard Tension - Iron Expansion Plug Driver 1987-1988 Chevrolet R20 Standard CabProduct Description: Piston Rings Economy 4. 060 in Bore Drop In 5 64 x 5 64 x 3 16 in Thick Standard Tension Cast Iron Phosphate 8 Cylinder From pistons to engine bearing components, Speed Pro offers an array of performance engine parts. You can rely on Speed Pro for industry leading performance engine technologies, from cutting edge Digital Diamond Profiled pistons to A Series bearings. They are engine components performance enthusiasts and racers