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1967 Pontiac GTO 400 dyno Ram Air exhaust manifold


Dyno test and tuning this mild, pump gas friendly 9.5:1 400 build for a 4 speed 1967 GTO. Using the original Qjet, iron intake, 670 heads with 2.11/1.77 valves and mild porting by CPM, modern hydraulic roller camshaft and full roller rockers, and Ram Air exhaust manifolds with crimp bent 2.25″ head pipes, this build managed 392HP @5200 rpm and 468lbs of torque @ 3600 rpm on BP 93 octane with 10% Ethanol, perfect for a great street cruiser.
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