COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness RS00500305 Pro Series Bolts are rated

Pro Series Bolts are rated at 190

Filter flows enough fuel for any race car

Viton with Larger 2

Vehicle Applications: 2011-newer Ford MustangVehicle Applications: 2011-newer Ford Mustang

COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness RS00500305 Pro Series Bolts are ratedLate 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