Holley vacuum secondary 4-barrel carburetor base plate. Casting number 12r-1856. Primary linkage moves free, secondary is froze tight from sitting. See pics for condition.
Holley 4150 4-barrel Carburetor Baseplate 650 700 750 800 CFM Double Pumper BP2
For Edelbrock Carburetor 1405 Performance 600 cfm 4Barrel Carburetor
4Barrel Carburetor For 1967 1968 1969-1970 Pontiac 350 400 428 455 Firebird 6.6L
4Barrel Carburetor Fit 1967 1968 1969 1970 Pontiac 350 400 428 455 Firebird 6.6L
4Barrel Carburetor For 1967 1968 1969 1970 Pontiac 350 400 428 455 Firebird 6.6L
600 CFM For Holley 4160 Carburetor 4-Barrel Carburetor Set 600 CFM Carburetor
