NOS GM, new in GM box. 
Fits Rochester Quadrajet, DualJet, Two-Jet (2G) carburetors.

Note:Hot Air choke mounts directly to carburetor choke housing.
When heated, the bi-metal spring un-winds.

Choke coil spring can be carefully removed and flipped over and re-installed. This will allow coil to rotate in opposite direction if needed.

Originally designed for Rochester Two Jet (2G):
Buick 231, 305 1977-78
Checker 350 1975-76
Chevrolet 260, 305, 350 1975-78
Chevrolet Truck 260, 305, 350 1975-78
GMC 305, 350 1975-76
Oldsmobile 305 1977-78
Pontiac 305 1977-78
Buick 231, 305 1977-78