77 grand prix headers

by mikei1253 Tue Aug 27, 2013 12:15 pm

im looking to get headers for my 77 grand prix and cant find them anywhere. is there another car that has them that will fit mine? or does anyone know where i can find some for a decent price

by Sleddogg Tue Aug 27, 2013 12:32 pm

I have the same dilemma, I assume your running a Pontiac engine. I cannot confirm, but have heard that the Heddman PN 28140 will work, again, I haven't gotten the stones to spend 215 bucks on something that "might" work based on other's comments. Summit lists them as fitting 73-74 Grand Prix...

by mikei1253 Tue Aug 27, 2013 12:38 pm

yeah i have the 400 pontiac engine in it

by Sleddogg Tue Aug 27, 2013 1:59 pm

That part number is designed for Pontiac engines, they are a 3 tube design; where the center cylinders on each head merge into one pipe. If you have ever installed headers on a Pontiac engine, it makes installation much easier. They do however, have a slight impact on flow, but still better than stock log manifolds. Jim Hand mentions the three tube design in his book, I can't remember off hand if it was enough disruption in flow to really make that much of a difference on a street car. Another option, that flows as good (or better depending on the header) are Ram Air manifolds. They are basically factory headers, but are designed to fit without the headache of headers. Ram Air Restorations sell some really nice units and the price is comparable to a quality set of headers, I am strongly considering replacing my stockers with these. Check out this link for more info

http://www.ramairrestoration.com/factory-headers

Good luck with your search

Jesse

by ant7377 Tue Aug 27, 2013 5:20 pm

Wow those are cool, if I get a Pontiac im putting them on it.

by big-g-67gto Tue Aug 27, 2013 5:52 pm

If you ever use those factory style HO (ram air) manifolds for your pontiac, you will never look at headers again........I have a set on my goat, could not be happier.

by Sleddogg Tue Aug 27, 2013 7:31 pm

Here is the page for the manifolds for our cars

http://www.ramairrestoration.com/rm-1-os-d-port-ram-air-style-factory-headers-oversized.html

by mikei1253 Wed Aug 28, 2013 8:53 am

thanks a bunch every one i'll probably go that route then. rest of the exhaust system will probley be a bit more but atleast there better than stock n will let my car breathe a little better. much appreciated

by Pontichev327 Wed Aug 28, 2013 12:57 pm

I have a set of black Flowtech Headers part # 31170-FLT for Pontiac. They were in the trunk of my 73 Grand Am when I bought it. I won't be using them, if they fit for you let me know, I'll sell 'em for half of whatever catalog price is. On line they are 300.00, Make offer.

by mikei1253 Fri Sep 06, 2013 9:26 am

are those flowtechs for a 400ci pontiac and are they 4 tube or 3 tube cause i think all i can fit is the 3 tube style ones if they fit at all

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77 grand prix headers

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