4.310" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 The outer case is made

The outer case is made from 8620 Chrome-Nickel-Moly steel and the case hardened for long life

straight ball-milled

Reproduction Rev Limiter Assembly used on 1970 428 Cobra Jet/SCJ Cars and 1970 Boss 429

crafted from superior

and less chance of crank failure

4.310" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 The outer case is 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.