Fitment (HEI only): Compatible with GM vehicles equipped with a coil-in-cap HEI distributor cap marked BAT and TACH (approx. 1975–mid-1980s). Works on Chevrolet/GMC C/K pickup, K5 Blazer/Jimmy, Suburban, Camaro, Nova, Monte Carlo, Caprice/Impala, El Camino, Corvette, G10/G20/G30 vans; Pontiac Firebird/Trans Am, Grand Prix, LeMans, Bonneville; Oldsmobile Cutlass/88/98; Buick Regal, Skylark, LeSabre; Cadillac DeVille, Fleetwood, Eldorado—when fitted with HEI.
Engine coverage for search: Includes GM engines commonly running HEI: Chevy small-block 262/265/267/283/302/305/307/327/350/400; big-block 396/402/427/454; Buick 231 V6/350/455; Oldsmobile 260/307/350/403/455; Pontiac 301/350/400/455; Cadillac 425/472/500; plus many HEI retrofits on classic GM platforms (coil-in-cap style). Use as examples for search; actual fitment depends on the presence of HEI BAT/TACH posts..
OE: 12167658 (HEI power & tach connector, OE reference); 170072 (dual pigtail style); 170073 (separate BAT & TACH leads); G5211; 23074. All refer to the HEI BAT/TACH pigtail used on GM coil-in-cap distributors. Related terms: “HEI battery tach pigtail”, “HEI BAT/TACH connector”, “HEI power tach harness
Usage / host components: Connects the 12-V BAT feed and TACH signal at the HEI distributor cap (coil-in-cap). Replaces loose spade terminals with a locking tab “shark-fin” design for a secure connection. Works with 4-pin/5-pin/7- or 8-pin HEI modules and any distributor cap that has BAT/TACH posts. Typical hosts are GM HEI distributors used on Chevrolet, Buick, Oldsmobile, Pontiac, Cadillac and GMC cars and light trucks from 1975 into the mid-1980s, and countless HEI retrofit units.