I just picked up a jet boat powered by a 455 Olds with big C heads. Nice engine but the previous owner over revved her, bent some pushrods, broke some valve heads off and badly damaged one head.
I need to put in a temporary engine to use the boat while I go through the 455. I have a sweet 1990 Olds 307. In my research I see that some exhaust manifold gaskets are listed as the same and some are not. Water pump plate gasket appears to be the same. I need a definative answer from an Olds Guru .. will The Hardon exhaust manifolds and water pump plate bolt to the 307? And will the drive coupling (flexplate) bolt to the crank. The engine itself, I'm assuming, will bolt in without any modifications .. Thank you for your time ... Frank in Arizona