Distributor Vacuum Advance MSD fits GMC 1987-1991 V3500

New HEI Adjustable Vacuum Advance Fits all 6 & 8 Cylinder HEI Distributor

MSD Distributor Vacuum Advance fits GMC 1987-1991 R3500

MSD Distributor Vacuum Advance fits GMC 1987-1991 R1500 Suburban

MSD Distributor Vacuum Advance fits with Chevrolet V3500 1989-1991

MSD Distributor Vacuum Advance fits GMC 1987-1991 R2500 Suburban

MSD Distributor Vacuum Advance fits GMC 1987-1991 V1500 Suburban

MSD Distributor Vacuum Advance fits GMC 1987-1991 V2500 Suburban