ii found a full 2.5 header on ebay for 90 buck american. i have a 1986 pontiac fiero 2m4. do you think this header would properly work with this car? Performance wise? http://cgi.ebay.ca/FIERO-2-...C39%3A1%7C240%3A1318

Nope, won't work with your car, sorry.
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I bet you're going to ask "why?"
...and I'd be glad to tell you.

Exhibit A: A stock 84-86 Duke exhaust manifold gasket. *The 3 bolt hole side is "up"*


Exhibit B: Your auction piece.


See the difference?

There were some superduty heads set up to run that backwards header flange; but no duke sold on the street ran that flange. Either that, or you could point your exhaust straight up through the decklid.

Sorry
Kurt

[This message has been edited by KurtAKX (edited 01-29-2009).]

Occassionally 2.5 headers come up on the mall but not often ,, you have to watch for them..or put in a request"" want to buy""some one may have one ,,some one must have a set of hooker headers they want to sell....The last one was on the mall for at least a week(surprised me ,but that was almost a year ago..
do not expect it to be in good shape !!
You could redrill and adapt this to your head .I do not see why this would not work ,,maybe there is something Im not seeing..maybe the outer holes are not equidistance ??
My 88 duke had a tube free flowing header type manifold I think this was a stock part,, this could be adapted the the earlier model if adept with welder and BMF

[This message has been edited by uhlanstan (edited 01-29-2009).]

Hmmm... looks like they welded the center flange on upside down. I guess once they realized their mistake, they decided to sell on eBay rather than fix it.

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2002/2003/2004 World of Wheels Winner &
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My SD4 Indy www.fiero.nl/forum/Forum2/HTML/096075.html

ya but if you look at the gasket, the bolt pattern is the same

quote Originally posted by iwantarotaryfiero: ya but if you look at the gasket, the bolt pattern is the same

Yeah, you're right. In that case, those are NOT fiero headers, they are for a Jeep and supposed to go up through the hood.

DEC makes other Jeep headers for the same purpose. http://www.decheaders.com/s...ex&cPath=64_65_43_46

all you have to do is redrill the holes in the center flange

You'd have to drill the side ones, too. The side flanges are supposed to have the top holes toward the center, and the bottom holes toward the outside.

quote Originally posted by iwantarotaryfiero: all you have to do is redrill the holes in the center flange

Exactly!! Line up a new gasket to the header flanges and mark the holes. Then simply punch a dimple in the center of each and drill them. Problem solved. Then fabricate a custom exhaust-done!

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
87GT - 3.4L Turbocharged engine, modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "