4.560" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 improved throttle response and better

improved throttle response and better fuel economy

Additional fittings may be required depending on your application

Speedmaster water pumps have a bigger impeller and larger cavity size to flow 40 percent more coolant than stock

yet require less horsepower to turn

and their special serrated nuts guard against pan loosening during operation

4.560" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 improved throttle response and betterThese 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.