marcgyver77
Newbie
Posts: 39
Age: 67
Loc: United States
Reg: 03-29-14
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12-30-24 11:56 PM - Post#2876664
Does anyone know what headers will fit a '97 Expess 2500 5.7 (L31) van? Or a good flowing performance exhaust manifold?
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bobb
Super Senior Member
Posts: 6907
Loc: paradise
Reg: 09-05-03
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01-05-25 09:27 AM - Post#2876818
In response to marcgyver77
do you have logs now? i thought all x manifolds were streamlined by now.
| 70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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1983G20Van
Super Senior Member
Posts: 3997
Loc: Hurst, Texas, USA
Reg: 11-13-02
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01-07-25 04:08 PM - Post#2876874
In response to marcgyver77
The only headers made for the 96-02 Express chassis have not been made in a few years now. Doug Thorley made a very nice set at one point for them. There are probably some others that fit and I know that shorties will typically fit. When my stock manifolds cracked at about 50K miles, I put a pair of coated Summit branded shorties that were made by either JBA or Flowtech at the time. The shorties made a significant power and a noticeable mileage increase on an otherwise stock engine. The stock manifolds are JUNK. The stock manifolds being cracked destroyed the stock catalytic converters. I replaced the cats with 3" high flows and also replaced the restrictive stock dual 3" inlet single 2.75" outlet stock muffler with an aftermarket muffler made for a 2006 8.1L that was dual 3" inlet and single 4" outlet and matching tailpipe.
https://www.summitracing.com/parts/big-91832-1flt/ ...
| 1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals |
Edited by 1983G20Van on 01-07-25 04:12 PM. Reason for edit: No reason given.
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marcgyver77
Newbie
Posts: 39
Age: 67
Loc: United States
Reg: 03-29-14
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01-09-25 03:45 AM - Post#2876915
In response to 1983G20Van
Looked up the headers on Summit, sounds like the way to go, along with the rest of the exhaust system upgrade.
Thanks for the reply...
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