389/455 swap - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 05-26-2008, 12:28 PM Thread Starter
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389/455 swap

will a 455 go in a 66 GTO w/o modifying mounts?
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post #2 of 3 (permalink) Old 05-26-2008, 03:58 PM
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Yes, It should not be a problem. Years a go I put a 455 in a 66 GTO, as I recall it was no issue. You may need to buy diffrent engine mounts. I can't remember. But no other mods were necessary....Eric

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post #3 of 3 (permalink) Old 05-27-2008, 09:13 PM
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It will bolt right in. It is the exact same size externally as the 389. Nobody will know it's not a 389 unless you tell 'em! The mounts are the same. Good luck........
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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