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3.4L Headers? by heypal
Started on: 11-30-2018 09:38 AM
Replies: 4 (297 views)
Last post by: pmbrunelle on 12-18-2018 06:44 PM
heypal
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Report this Post11-30-2018 09:38 AM Click Here to See the Profile for heypalClick Here to Email heypalSend a Private Message to heypalEdit/Delete MessageReply w/QuoteDirect Link to This Post

This morning I Googled "3.4L Headers". Sure enough a couple options popped up. Is there any merit to using them in a 3.4 swap? They have to flow better than the lousy stock manifolds.

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Spadesluck
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Report this Post11-30-2018 09:42 AM Click Here to See the Profile for SpadesluckSend a Private Message to SpadesluckEdit/Delete MessageReply w/QuoteDirect Link to This Post

Headers you really cannot lose out. However depending on what's done to the car is how much you may benefit from them. I am sure you can find 3.4 headers but finding a set to fit in the fiero could be a bit challenging. The stockers ported out are not all that terrible. If I was going to change anything it would be the ypipe that connects the headers together.

[This message has been edited by Spadesluck (edited 11-30-2018).]

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Dennis LaGrua
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Report this Post12-07-2018 11:49 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post

Since the sprints were discontinued the only headers available are for the S10 . They won't fit a Fiero install without serious modifications. I have a new S10 set but they won't fit without serious modifications.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
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[This message has been edited by Dennis LaGrua (edited 12-17-2018).]

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Blacktree
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Report this Post12-16-2018 05:07 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post

Porting the stock manifolds and Y-pipe helps, but headers are even better. It's been proven that porting the stock exhaust yields 8-10 HP. And my dyno test of the Trueleo headers yielded 7 HP more than a ported exhaust. So a good set of headers should yield about 15 HP over stock.

As for sources... good luck. Headers used to be available from the Fiero Store and Trueleo, but not any more. I'm hesitant to recommend WCF, because of their shaky reputation.

Edit to add: Keep in mind the Camaro / S10 headers are for a longitudinal setup. And the Fiero has a transverse setup. The S10 headers will probably interfere with the Fiero transaxle, plus the exit will be in the driver side wheel well. In other words, you'll need to make some serious modifications to make those headers work.

[This message has been edited by Blacktree (edited 12-16-2018).]

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pmbrunelle
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Report this Post12-18-2018 06:44 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post

What's your budget? What are your shop skills like?

That might rapidly narrow down the choices.

[This message has been edited by pmbrunelle (edited 12-18-2018).]

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