4.000" - 4.060" Bore Piston Oil Ring Rail Spacer Support (0.020" Thick) These chrome water necks from

These chrome water necks from Speedmaster add a touch of class to your cooling system

Whether you're rebuilding a stock engine or changing to valve springs that have more seat pressure

That means you get more airflow headed down the carburetor or throttle body and into the combustion chamber

the stock accessories may not run at the same speed as originally designed

the least runout

4.000" - 4.060" Bore Piston Oil Ring Rail Spacer Support (0.020" Thick) These chrome water necks fromThese 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.