COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness Header Bolt If you are looking for

If you are looking for a Min/Max product

or when dual pumps are employed and both pumps will not always be running together

1963-1970 Ford Falcon

AutoMeter's race proven air-core electric tachometers provide quick and accurate readings with a needle so responsive it can go from 0 - full scale in 333 milliseconds

1961-1962 Chevrolet P10 Series

COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness Header Bolt If you are looking forLate model Big Block Chevrolet engines are originally equipped with exhaust valve rotators. Until now, the only way to make up for the rotator was to stack . 300" of shims under the spring. This was sloppy but also did not fit as well as these seat spacers. These will locate the spring with an outside step so the spring cannot "walk" around on the head. Avoid stacking . 300" of shims under the valve springs on your Big Block Chevrolet with our seat