4.000" - 4.060" Bore Piston Oil Ring Rail Spacer Support (0.020" Thick) you must use one that

you must use one that is also approved as street legal for your application

One very small

You can get up to 50 percent more starting power when you pick one of these Speedmaster high-torque mini starters

but not included

4.000" - 4.060" Bore Piston Oil Ring Rail Spacer Support (0.020" Thick) you must use one thatThese 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.