Cam Gear Drive?

Gear drive takes care of a sloppy chain when the crank moves closer to the cam because of boring or honing the mains. Gear drives have an idler fixed to the cover or the idler fixed to a plate bolted to the cover. Fixed to the cover requires that the cover be shifted on the block to get the correct backlash. Then the cover is pinned by drilling and using new locating dowels. The plate style sets the lash by moving the plate and torquing the four nuts and bolts down. Whatever you do, make sure to use a Torrington bearing behind the cam gear.