Late 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 spacers. These spacers feature a 1.732" outer diameter for 1.568" outer diameter springs.
Exhaust Rotator Eliminator O.D. is 1.732"; Exhaust Rotator Eliminator is .300" Thick; For Big Block Chevrolet engines originally equipped with exhaust valve rotators
Seat Spacer Set for Big Block Chevrolet - 1.568" OD, .623" ID, .300" Thickness
COMP Cams Big Block Chevrolet Exhaust Rotator Eliminators
Seats BBC 1.568" OD .623" ID .300" Thick
COMP Cams Rotator Eliminators CB Exh.
See 4779-1 for a single seat spacer.
Rotator Eliminators, CB EXH.
Engine Valve Rotator
None
