The HEI Vacuum Advance Stop, allows you to limit the amount of vacuum advance that occurs while driving. It is designed for use on the Street Fire HEI, PN 8362 and the MSD Pro-Billet, PN 8365. The two are easy to distinguish; the Street Fire has a cast aluminum housing while the MSD model is billet, polished aluminum.
The HEI Vacuum Advance Stop, allows you to limit the amount of vacuum advance that occurs while driving. It is designed for use on the Street Fire HEI, PN 8362 and the MSD Pro-Billet, PN 8365. The two are easy to distinguish; the Street Fire has a cast aluminum housing while the MSD model is billet, polished aluminum.