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 455 manifold
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bober
Sitting Bull

142 Posts

Posted - 31 Dec 2014 :  3:25:46 PM  Show Profile  Reply with Quote
I'm switching my 350 Pontiac for a 455 and want to know if it's possible to reuse the manifolds from the 350 with duals already on it ? I can get some headers but don't really want headers and the headaches that come with them . I'm not racing with it so HP isn't all that important as long as won't damage engine .I have a 76 F/bird w/auto. Thanks

tjs44
Cochise

USA
413 Posts

Posted - 31 Dec 2014 :  4:54:08 PM  Show Profile  Reply with Quote
yes as long as the 455s are D ports.Tom
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Phil
The Great White Buffalo

USA
7222 Posts

Posted - 01 Jan 2015 :  12:20:14 AM  Show Profile  Reply with Quote
X2. Same same.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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Phil
The Great White Buffalo

USA
7222 Posts

Posted - 01 Jan 2015 :  12:22:22 AM  Show Profile  Reply with Quote
What heads on the 455? Are all 6 exhaust holes in each head?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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tjs44
Cochise

USA
413 Posts

Posted - 01 Jan 2015 :  11:00:24 AM  Show Profile  Reply with Quote
cast iron exhaust having all 6 bolts is not that big of deal.Some manifolds dont even have all 6.Headers are another issue.Tom
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bober
Sitting Bull

142 Posts

Posted - 01 Jan 2015 :  3:03:50 PM  Show Profile  Reply with Quote
quote:
Originally posted by tjs44

cast iron exhaust having all 6 bolts is not that big of deal.Some manifolds dont even have all 6.Headers are another issue.Tom

I'm sure they have all 6 . They're 6x4 of my 76 350p .I may end up with headers if I find some that I like . What size pipe can I get by with ? Also is there a way I can eliminate the heat riser as it's not connected anyway ? Thanks
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bober
Sitting Bull

142 Posts

Posted - 07 Jan 2015 :  7:09:05 PM  Show Profile  Reply with Quote
quote:
Originally posted by Phil

What heads on the 455? Are all 6 exhaust holes in each head?


The heads I'm using are 6x4's from the 350p in the 76 bird now and I have true duals with 40 or 44 series flowmasters.I'm not drag racing with it so I don't need every bit of hp out of it . I'm a little concerned about putting headers on but if it would be a big plus I can . Just worried about leaks with headers .Thanks for the info
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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 08 Jan 2015 :  12:07:04 AM  Show Profile  Reply with Quote
Depends on the combo. stock or near stock builds will show little to no gain with headers. Aggressive street strip cams need the extra exhaust runner length to create momentum and enhance engine breathing. The 5th stroke. http://www.hotrod.com/how-to/engine/hppp-0312-headers-vs-manifolds/


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Phil
The Great White Buffalo

USA
7222 Posts

Posted - 08 Jan 2015 :  1:24:53 PM  Show Profile  Reply with Quote
Good heads and I've used the same ones. Just use as you have with manifolds and go from there in the future if you need to.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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