Moroso adjustable vacuum advance kit. Fits Chevrolet-GMC inline six HEI distributors.
Moroso adjustable vacuum advance kit. Fits Chevrolet-GMC inline six HEI distributors. Adjust with included allen wrench some what like adjusting an automatic transmission modulator. Gives maximum part throttle performance while preventing harmful effects of spark knock. Part #72315.: $28.75. Distributor shown in picture is not included.
