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Speed Pro Economy Piston Rings 3.905" Bore 5/64 x 5/64 x 3/16" Thick Standard Tension - Iron 1530A Much lighterProduct Description: Piston Rings Economy 3. 905 in Bore Drop In 5 64 x 5 64 x 3 16 in Thick Standard Tension Cast Iron Natural 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 can