Avoid stacking .300" of shims under the valve springs on your Big Block Chevrolet with our seat spacers. These spacers feature a 1.732" outer diameter for 1.568" outer diameter springs.
Exhaust Rotator Eliminator O.D. is 1.732"; Exhaust Rotator Eliminator is .300" Thick; For Big Block Chevrolet engines originally equipped with exhaust valve rotators
