Only minor changes were made to the 1967 Tempest, Custom and Le Mans models. The GTO 389 cu. in. V-8 was replaced by a new 400 cu. in. V-8. The Rochester 4bbl. carburetor replaced both the standard GTO Carter AFB 4bbl and the 3 × 2bbl. carburetor option. The Turbo Hydromatic TH-400 replaced the previous Buick Super Turbine two speed automatic. The 326 cu. in. V-8's remained unchanged. The 4bbl. OHC six was uprated to 215 hp (160 kW; 218 PS). Front disc brakes were a new option along with a stereo 8-track tape player and hood-mounted tachometer.
Source: Wikipedia (original)