Speed Pro Piston Rings - 4.155 in Bore - File Fit - 1/16 x 1/16 x 3/16 in Thick - Standard Tension SP115BK 1:1 Gear Reduction

1:1 Gear Reduction

Manufactured from 25mm heavy-duty bar stock for increased strength

2007-2019 GMC Sierra 3500 HD Crew Cab Pickup

Positively locates itself on the main body of 4500 HP(R) style carburetors

Add UMI sway bars for even better performance

Speed Pro Piston Rings - 4.155 in Bore - File Fit - 1/16 x 1/16 x 3/16 in Thick - Standard Tension SP115BK 1:1 Gear ReductionSpeed 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