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Headers For A 1991 305 V8?
#783572 October 10th 2021 8:14 am
Joined: Aug 2009
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soundhd Offline OP
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Have a 1991 “Shorty” with a stock 305 V8 (auto; PS; PB; A/C). In the process of looking into increasing the horse power a bit with bolt on’s. Upgraded exhaust system is step #1…(No racing, just going to cruise nights & shows). Found a couple sets from Hooker, info says it will fit my year of G- Series van. Just wondering if anyone has installed a set on a late 80’s to early 90’s van? If so we’re their any modifications needed for them to fit correctly?
Plan is to remove the entire old stock exhaust system (which is still in place) and have a dual exhaust system installed (using Dynomax Ultra Flow mufflers) with tips coming out each side just in front of the rear wheels.

Thanks

Last edited by soundhd; October 10th 2021 8:15 am.

Recently purchased (10-2021) a 1991 Chevy G-20 “Shorty”. Past vans are a 1976 Chevy G-10 (purchased new in 1976 & sold in 1995). A 1978 Chevy G-20 Shorty purchased in 2010 and sold in 2015.
Re: Headers For A 1991 305 V8?
soundhd #783576 October 10th 2021 12:20 pm
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G Van Man
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I had the older style Thorley Tri-Ys on my 83s 305, later swapped in a 92 TBI 350. No modification nexessary other than adding a hedman heat riser setup to preheat the air cleaner.


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: Headers For A 1991 305 V8?
1983 G20 Van #783592 October 10th 2021 5:15 pm
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soundhd Offline OP
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Looked at the Doug Thorley's web site and could not find one for the G-Series van. Do know what the stock number was?

thanks


Recently purchased (10-2021) a 1991 Chevy G-20 “Shorty”. Past vans are a 1976 Chevy G-10 (purchased new in 1976 & sold in 1995). A 1978 Chevy G-20 Shorty purchased in 2010 and sold in 2015.

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