4.540" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 Speedmaster aluminum pulleys are made

Speedmaster aluminum pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs

The Speedmaster shift selector shaft uses an O-ring to prevent leakage from GM TH400 cases

capable of withstanding valve spring load

These housings can be flipped 180 degrees for either a left or right outlet location

these cams provide better throttle response and more top-end horsepower than equivalent cams from other manufacturers

4.540" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 Speedmaster aluminum pulleys are madeThese Speedmaster piston oil ring spacers are used in applications where the piston oil ring groove intersects the pinhole. Speedmaster piston oil ring spacers are manufactured from spring steel and install against the bottom sill of the oil ring groove. Available in different bore diameters to suit your specific engine's needs, the Speedmaster piston oil ring spacers will keep your pistons working smoothly throughout the entire operating range.