Speed Pro Piston Rings - 4.040 in Bore - Drop In - 1/16 x 1/16 x 3/16 in Thick - Standard Tension H777C05XXL 95mm Throttle Body - 4

95mm Throttle Body - 4

Carburetor Inlet Straight

6 AN Inlet / Outlet

GM Fullsize Truck 1977-78

Speed Pro Piston Rings - 4.040 in Bore - Drop In - 1/16 x 1/16 x 3/16 in Thick - Standard Tension H777C05XXL 95mm Throttle Body - 4Speed 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 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 Rings: Speed Pro Hell Fire rings, manufactured from a specially hardened