Will a 65 gto 398 tripower fit on a 64 389?

Asked by Goathungry Mar 12, 2013 at 08:33 PM about the 1965 Pontiac GTO

Question type: Car Customization

I have a 64 gto engine 389 and have a chance to buy a 65 gto 389 tripower. Will it fit? It looks like the heater hoses are hooked up different. thanks

5 Answers

176,685

I would give it a shot. Check with the people over at www.highperformancepontiac.com to see if there were any engine changes between the two years.

1 people found this helpful.
185

Please do your home work on this! there are differences in porting with some engines; the restoration guide will be your best friend and the advise given above is also excellent.

10

The 65 tri-power will not fit the 64 engine without changing the heads to 65 and up. The bolt pattern is different.

1 people found this helpful.
10,755

Exactly right, intake bolt pattern changed in '65, so you will need 65 and up heads. There's a ton of them out there. If this is going to be a street car, get the 6x, they have the larger valves, moderate compression ratio for today's crap gas, and better porting. Put some stainless valves and bronze guides and you'll have a reliable setup. Check the head comparisons at Wallace Racing. Butler Performance is also a good source.

2 people found this helpful.

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