ATI Super Damper SFI 18.1 Harmonic Balancer - 7.074 in OD - Black Oxide - External Balance - Big Block Chevy ANT-SPARE-MAG-KIT-V They fit the valve stems

They fit the valve stems well and can be removed with relative ease because of a tiny hole to relieve the suction created when removing the lash cap

1-3/4 or 2 in

Compatible with Flex Fuel (E85/E90) and all types of gasoline (100% Alcohol fuels may diminish fuel pump life)

1977-2001 GMC Jimmy

ATI Super Damper SFI 18.1 Harmonic Balancer - 7.074 in OD - Black Oxide - External Balance - Big Block Chevy ANT-SPARE-MAG-KIT-V They fit the valve stemsThe patented ATI Super Damper is the only crankshaft damper designed exclusively for high performance Chevy engines. ATI BB Chevy 7" Harmonic Damper SFI 917740 Super Damper Harmonic Balancer External Balance Steel Black Chevrolet 454 ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over