1967 Pontiac GTO
IN 1967, Pontiac had to revise their top model GTO according to a GM mandate that limited engine size to 400 in³ and a single carburetor on everything but their sports cars. In response, Pontiac raised the displacement on the the 389 and the High Output (HO) 400 was born.
The 400 HO used a new exhaust manifolds, the 1966 Tri-power camshaft and a Rochester Quadrajet on a new intake manifold.
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