The 400 Pontiac engine was a new evolution of the familiar Pontiac V-8 introduced in 1955 and an upgrade of the 389 built from 1959-66.
In addition to an overbore from 4.06 to 4.12 inches, the updated Pontiac V-8 featured new freer-flowing cylinder heads with larger 2.11-inch intake and 1.77-inch exhaust valves, as well as revised ports andUsed 1967 Pontiac GTO
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