The GTO underwent a few styling changes in 1967. The louver-covered tail lights were replaced with eight tail lights, four on each side. Rally II wheels with colored lug nuts were also available in 1967. The GTO emblems located on the rear part of the fenders were moved to the chrome rocker panels.
The GTO also saw several mechanical changes in 1967. The Tri-Power carburetion system was replaced with a Rochester Quadrajet four-barrel carburetor. The 389 engine received a wider cylinder bore (4.12 inches) for a total displacement of 400 CID V8. The 400 cubic inch engine was available in three models: economy, standard, and high output. The economy engine used a two-barrel carburetor rather than the Rochester Quadrajet and produced 255 bhp at 4400 rpm, and 397 ft·lbf at 4400 rpm. The standard engine produced 335 bhp at 5000 rpm, and the highest torque of the three engines at 441 ft·lbf at 3400 rpm. The high output engine produced the most power for that year at 360 bhp at 5100 rpm, and produced 438 ft·lbf at 3600 rpm. Emission controls were fitted in GTOs sold in California.
1967 also saw the installation of significant safety equipment as required by federal law. A new energy-absorbing steering column was accompanied by an energy-absorbing steering wheel, padded instrument panel, non-protruding control knobs, and four-way emergency flashers.
The two-speed automatic transmission was also replaced with a three-speed Turbo-Hydramatic TH-400. The TH-400 was equipped with a Hurst Performance Dual-Gate shifter, called a "his/hers" shifter, that permitted either automatic shifting in "Drive" or manual selection through the gears. Front disc brakes were also an option in 1967.
GTO sales for 1967 remained high at 81,722.
