4.280" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 and less chance of crank

and less chance of crank failure

Too little oil causes stem and guide wear

These Speedmaster crankshafts are made from the same strong aircraft-quality forging as standard-weight cranks

a new lower housing casting for enhanced fuel flow

This is our most popular manifold and is showing up on many performance street machines and street rods

4.280" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 and less chance of crankThese 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.