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Old 06-08-2008, 04:57 PM
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389 pontiac

does anyone know if 1964 heads of of a 389 will fit a 65 389 i ran into a problem i have a show condition tripower set up of of a 64 389 but my engine is a 65 389 i was hoping i could put a set of 64 heads on the engine and i could use the tripower set up anyone have any ideas thanks

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Old 06-08-2008, 09:38 PM
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I knew that in 67, they changed the valve geometry so I didn't think the piston valve reliefs are in the right location after 66. But I wasn't sure how far back you could go. According to Wallace, you can interchange 61-66 heads.

http://www.wallaceracing.com/interchange.htm

You should be OK putting the 64 heads and intake on your 65.
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Old 06-09-2008, 01:23 AM
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Agreed. The transition year was 66-67, but even so the only real difference was pushrod length. I didn't have any valve relief problems putting 73 heads on my 66 389.
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Old 06-09-2008, 11:43 AM
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Quote:
Originally Posted by baadgoat65
does anyone know if 1964 heads of of a 389 will fit a 65 389 i ran into a problem i have a show condition tripower set up of of a 64 389 but my engine is a 65 389 i was hoping i could put a set of 64 heads on the engine and i could use the tripower set up anyone have any ideas thanks
The blocks are the same. As long as you use the 64 heads w/the 64 intake, you're good to go!
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