4.250" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 and feature low-resistance terminals to

and feature low-resistance terminals to maximize conductivity

Featuring high strength Aircraft Grade Aluminium which is lightweight

These drives fit under your stock timing cover and come complete with instructions

Instead of spending the time and money refurbishing your existing heads

They're roll-threaded

4.250" Bore Piston Oil Ring Rail Spacer Support (0.030" Thick) Set of 8 and feature low-resistance terminals toThese 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.