COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness 935172 Chevrolet Truck 1972

Chevrolet Truck 1972

when you need an elevated idle

70-73 Camaro/Firebird

Ford Truck 1980-97

3/1Rating (SFI-1)

COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness 935172 Chevrolet Truck 1972Late 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