4.560" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 which is much stronger than

which is much stronger than stock steel and mates better with an aluminum case

These can be used on std or aftermarket plenum manifolds

improved throttle response and better fuel economy

This manifold will typically produce more power than any similar competitive manifold due to larger ports and runners

This particular unit retains a stock-style pulley to allow this unit to be used in stock applications

4.560" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 which is much stronger thanThese 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.