Fudging the Horsepower Numbers for 1967
Chevrolet >
Re-factored the 1966 'L-79' 327/350 HP to {325 HP} for 1967
Ford and Mercury >
Re-factored the 1966 'S-Code' 390/335 HP to {320 HP} for 1967.
Pontiac >
Took the 400/350 HP GTO engine, and dropped it in their new Firebird, and rated it at {325 HP}.
Also, they popped the 400/360 HP 'Ram Air' GTO engine in the Firebird, and rated it
at {335 HP}.
Note; Pontiac adjusted the linkage for the Rochester Carburetor on the Firebird
400 engines to restrict the Secondaries from fully opening.
Note; That was the 'only' difference between the GTO and Firebird engines.