Speed-Pro Standard Gap Plasma Moly Piston Ring Set - 4.250" Bore (+.060") - Top Ring: 1/16", 2nd Ring: 1/16", Oil Ring: 3/16", Oil Tension Ring: Standard H776C08XL 5/16" and 3/8" fasteners for

5/16" and 3/8" fasteners for most AMC

750 x 36 Spline

Fatigue life of cam bearings are nearly doubled

1978-1989 Mercury Grand MarquisWhen utilized with Sniper EFI

Organic / Carbon Composite

Speed-Pro Standard Gap Plasma Moly Piston Ring Set - 4.250" Bore (+.060") - Top Ring: 1/16", 2nd Ring: 1/16", Oil Ring: 3/16", Oil Tension Ring: Standard H776C08XL 5/16" and 3/8" fasteners forSpeed Pro designs and engineers pistons to meet the most demanding street performance and racing conditions. In combination, we draw upon more than 100 years of Speed Pro engine mastery to enhance the piston ring and its seal. Our Speed Pro(R) brand is recognized for being a winner in every form of racing, and is the proven horsepower leader in oval track and drag racing. Hell Fire(R) Rings: Speed Pro Hell Fire rings, manufactured from a specially