COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness Header Bolt 1988-1989 Lincoln Mark VII

1988-1989 Lincoln Mark VII

2A/5 & FIA 8856-2018 Certified

1982-1985 Oldsmobile Toronado

ASN Series Shocks

COMP Cams Seat Spacer BB Chevy Exhaust .300" Thickness Header Bolt 1988-1989 Lincoln Mark VIILate 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