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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.