Speed Pro Economy Piston Rings 4.020" Bore 5/64 x 5/64 x 3/16" Thick Standard Tension - Iron Exhaust Wrap The DUI is test fired

The DUI is test fired before leaving our facility to insure all components are working properly

Fuel pressure regulator not included

Best w/ aftermarket heads

8 bolt rear flange and center counterweighted

Unaffected By Most Fuels

Speed Pro Economy Piston Rings 4.020" Bore 5/64 x 5/64 x 3/16" Thick Standard Tension - Iron Exhaust Wrap The DUI is test firedProduct Description: Piston Rings Economy 4. 020 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