Crane Cams Adjustable Vacuum Advance Kit HEI Distributor

Crane Cams Adjustable Vacuum Advance Kit for HEI Distributors!  These adjustable advance kits allow you to dial in your vacuum advance to suit your specific needs.  You can now set the maximum ignition advance throughout the RPM range, while avoiding detonation.  Makes adjustments for fuel quality and altitude simple.  Kit includes a new vacuum diaphragm, advance weight springs, an Allen wrench and instructions.

**Note: Advance Weights and Limit Bushings are not included (you reuse your existing units).  Fits HEI's with vacuum advance distributors. Will not work with computer controlled HEI's.