1966 Pontiac GTO
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From this angle, what might seem like an ordinary '66 389 Tri-Power engine is actually a well-disguised 469ci engine that features 10:1 compression, ported No. 64 cylinder heads, an aggressive hydraulic flat-tappet camshaft from Nunzi's Automotive, and four-tube Doug Thorley headers. Those aren't Rochester two-barrel carburetors, however. Atop the cast-iron Tri-Power intake manifold are three IMPCO 125 CNG mixers, which act like conventional carburetors, but instead deliver varying amounts of natural gas vapor for normal engine operation in all conditions. View Related Article
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