Lapping the flywheel to the crank is an important part of flywheel installation. However the time it takes to lap one in is much shorter than most realize. We have a video attached to most flywheels on our web site and on our facebook page for visual illustration, but you only need around 20-30 seconds of work with a fine to medium grit compound to match the tapers together. Any longer (or using a coarse compound) could result in changing the shape of the flywheel taper or enlarging the taper. This will cause the flywheel not to mate properly and not stay secure on the crank, resulting in the flywheel spinning. Less is better when lapping along with proper torque settings on the particular flywheel you are using. Here are torque specs for each of our flywheel designs… 

Small Block Non Adjustable… 65 ft/lbs 

Adjustable (steel center hub)… 65-70 ft/lbs 

Ultra lite all versions… 55 ft/lbs 

Big Block Non Adjustable… 85 ft/lbs 

Adjustable… 85-90 ft/lbs

ARC Racing - Video #1, Billet Flywheel Installation