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i am still trying to see whats the most i can get out of my lowly 326! I have read that some guy has a set of 400 pontiac heads on his 326. Will that work or do any good?? Do any or all 389/400 heads fit a 326? sam
 

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Howdy, I woked at west burlington shops 3- years.
All the heads from 326, 350, 389, 400, 428, 455
will work get the number on your heads checked and from thes numbers you can idenify all your heads, cc's, valve sizes, know your compression
ratio, and you will be able to get heads that you know ahead of thing it'll be worth the effort, a excellent, web to desipher head numbers is www.
classicalpontiac.com they or you will be able to decode. numbers, 326,I would probably go 068 on
the cam(McKeller068), dual plane intake, balanced lowr end, new quadrajet, after finding right heads
 

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Check the heads before you buy, right on the side between the two middle header pipes(right above) there will be a number, if you can try to find heads with a 48 or 49 on them, I think you'll like them much better than any other number.
 
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