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Will 6X Pontiac heads that came out on 400 and 455 engines fit a 350 Pontiac engine?
Wiki User
∙ 12y ago
Yes, all tradional Pontiac V8 (287,317,326,347,350,370,389,400,421,428,455) heads will physically bolt to all blocks. The later 265/301 will bolt to older blocks also but the water passages between the head and block are different and there is no available intake manifold. 6X heads came on Pontiac 350-400 from 1975-1979. no 455s were factory equiped with 6X heads. There are two versions of the 6X, one stamped "4" and one stamped "8" the heads stamped 4 have smaller combustion chambers around 94 cc, the one stamped 8 are about 100-101cc. The 6X-8 head would give very low compression (about 7-1) the 6X-4 would be better but is still only about 7.6-1. High valve lifts can cause valve to cylinder wall interference on 350s since the bore is only 3.88".
Wiki User
∙ 12y ago
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