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Old 12-18-2008, 09:12 PM
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69 Pontiac 350 head swap

I have a 69 Custom S and it currently has the stock 350 in it. I have a pair of #64 heads that have the larger valves. Will swapping out heads work?

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Old 12-18-2008, 09:17 PM
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Quote:
Originally Posted by beeroh
I have a 69 Custom S and it currently has the stock 350 in it. I have a pair of #64 heads that have the larger valves. Will swapping out heads work?

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Old 12-19-2008, 09:52 AM
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moving it........Have you checked the valve size?....Chances are they are the same.
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Old 12-19-2008, 06:19 PM
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Quote:
Originally Posted by beeroh
I have a 69 Custom S and it currently has the stock 350 in it. I have a pair of #64 heads that have the larger valves. Will swapping out heads work?
The 64 heads do have bigger valves and will give you a true 9:1 compression, which is almost ideal for pump gas. Go for it and good luck. If you have anymore questions, I will address them on this forum.

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Old 12-19-2008, 11:58 PM
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Your Stock 1969 Pontiac should have #17 or #47 Heads on it . They are 72-75cc chambers with 196" in /1.66" ex Valves your right at 9.1 C/R with them . Now the #64 Heads are of a 1970 455 . They are 87cc chambers with 2.11" in / 1.77" ex Valves . These #64 Heads are great castings but save them for a 400 or 455 build . They will lower your C/R and them Larger valves are not needed for that Small Bore 350 . You will lose Power with them . I would have your stock heads rebuilt . Pontiac 350's are tricky to build with there 3.880" Small bore
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Old 12-20-2008, 07:53 AM
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here's a site for poncho heads.hope this helps
http://www.boyleworks.com/ta400/psp/heads.html
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Old 12-20-2008, 11:06 AM
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Quote:
Originally Posted by TANGO
Your Stock 1969 Pontiac should have #17 or #47 Heads on it . They are 72-75cc chambers with 196" in /1.66" ex Valves your right at 9.1 C/R with them . Now the #64 Heads are of a 1970 455 . They are 87cc chambers with 2.11" in / 1.77" ex Valves . These #64 Heads are great castings but save them for a 400 or 455 build . They will lower your C/R and them Larger valves are not needed for that Small Bore 350 . You will lose Power with them . I would have your stock heads rebuilt . Pontiac 350's are tricky to build with there 3.880" Small bore
I agree, the 64s are worth a lot to someone building a high performance 455 for street/strip and the smaller valve heads would be more responsive on a 350, but it would be wise to have screw in studs installed.
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Old 12-22-2008, 03:53 PM
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well thanks for everyones replies.. I was wondering if the 64 heads would of been a good swap because the 350 has a cam with a .454 lift so I was thinking that heads with larger valves would give it more HP..
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