1963 Bonneville 389 in a 66 GTO? - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 11-25-2014, 12:51 AM Thread Starter
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1963 Bonneville 389 in a 66 GTO?

I have a line on a 389 out of a 63 Bonneville. Anyone know if it is compatible in a 66 GTO? It also comes with a 4 speed hydromatic tranny and the same question of compatibility. Engine needs rebuilding but ran last time it was in a car.
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post #2 of 2 (permalink) Old 11-25-2014, 01:57 PM
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Not really. '63 engines had the starter mounted to the transmission instead of to the block. Adaptor plates are made, but it can be a hassle. Also engine mount issues. '65-'66 389's are still pretty much available, and are not overly expensive. Also, the heads and intake are different on a '63, and not interchangable with '65-up parts.
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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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