COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness RS00500305 750 to 1250 CFM

750 to 1250 CFM

24 & 25 Series big body steel shocks

These gaskets are used between the upper and lower manifolds to create an air tight seal and prevent erratic idle if a vacuum leak is present

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

1972-1986 Mercury Capri

COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness RS00500305 750 to 1250 CFMLate 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