Proform 66518BC Harmonic Balancer Cover 8" Blue Clamshell Package

Engine Harmonic Balancer Cover
These patented harmonic balancer covers offer improved readability, more stable Top Dead Center indication & timing accuracy, enhanced appearance for a previously ignored underhood area, & the elimination of timing tapes which are inevitably flung off. They are available in chrome & black, resulting in parts w/the appearance of $200 balancers. Each cover is distinctively marked w/Top Dead Center & the proper timing degrees. Using this cover improves timing accuracy because over time the etched outer inertia ring of a typical harmonic balancer may slip in relation to the center hub of the balancer, causing the etched markings to provide an inaccurate indication of Top Dead Center for the #1 piston. Mounted directly through the center hub, this cover eliminates the affect of any outer inertia ring slippage. Aluminum. U.S. Patent 5,675,078