In buying headers, what type of mods should you have done to decide whether or not to buy 1 3/4 or 1 5/8? I have a 91 GTA L98. Just wondering for future reference.
Darrell

 

Get the 1-3/4" for your 350 block.

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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

I have seen many debates over this subject. If its mostly stock I would almost say 1 5/8, that should be enough flow for your engine. If you engine is modified then probably go with the 1 3/4. There will be those who will say 1 5/8 is enough and others who will disagree. Either would work I imagine, its up to you.

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350 TPI
Flowmaster Cat-Back exhaust
ADS Superchip
Modified MAF
Smog equipment removed
Ported Plenum
TB Bypass
Homemade AFPR

 

Go with the 1 3/4 now or wish you did in time to come! Even if its stock.

 

Buy the coated 1 3/4" Hooker Super Comp long tubes. Can't get better than these. Even if your motor is stock, your exhaust will be ready for when you modify it. If your buying headers, might as well do it right and get ones that will last forever and be able to support any future mods. Besides, the long tubes also sound the best. When my tax return comes in, I'm buying these headers! If you have to stay smog legal, go with SLP.

 

Thanks for the replies so far! My mods as of to date are: Subframe connectors, ported plenum, AFPR, airfoil, Stage 1 Fastchip, K&N Filter, removed air canister (huge bottleneck), 373 Gears, Flowmaster Exhaust cat-back, removed both cats. I think thats it
Darrell
1991 GTA L98
Canada

 

i would say go with 1 3/4....i personally went with hooker LTs like mcconahay said. if you plan any future mods...definitely get 1 3/4s

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 LTs, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo here...but not installed yet)
MacEwen Motorsports White Gauge Overlays
14" K&N X-Stream Open Element
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window
http://www.geocities.com/esvalenz

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!

"Just because I've done it, doesn't mean I knew what I was doing!" - Me

 

I would always go with 1 3/4" on a 350 if you have the money. Even if you plan to do nothing more to the car, the 1 3/4" will get you more. I wish thats what I would have done.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!