Moroso Adjustable Vacuum Advance Kit - 1975-+81 GM HEI Distributors R03P015 and 375 automatic transmissions with

and 375 automatic transmissions with a reverse valve body

Dual 3 in Outlets

Offered in full aircraft quality 7075-T6 billet aluminum or steel / aluminum assemblies are available

Check for leaks

Moroso Adjustable Vacuum Advance Kit - 1975-+81 GM HEI Distributors R03P015 and 375 automatic transmissions withAllows you to change the amount of ignition vacuum advance for maximum part throttle performance while preventing the harmful effects of spark knock (detonation) Dial in as much spark advance as conditions permit add more advance under light load conditions to improve throttle response and fuel economy, or limit spark advance in high compression engines and high load conditions to eliminate knock Built in stop prevents the adjustment screw from