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Re: Headers on Chevy G20 w/350
frscke1 #771285 February 12th 2021 7:09 pm
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Thanks frscke. It's pretty damn aggravating Hedman says they're for van, and then they don't bolt right on. I'm for sure not running these stock manifolds so I'll post an update when I have one.


1987 G20
2019 Z900rs
2010 E61
Re: Headers on Chevy G20 w/350
fonman4277 #771286 February 12th 2021 7:12 pm
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ya just have to get the short pipe headers ... even the short headers were questionable with a 454 ...


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Headers on Chevy G20 w/350
fonman4277 #771289 February 12th 2021 7:22 pm
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Yeah, I'll get the shortys if the exhaust shop says "no go".

I looked around at shortys today, it's hard to find some that clear the doghouse edge, fit an oval port on a cast iron vortec head and leave the plugs accessible, and are coated. Link that magic part number if you got it


1987 G20
2019 Z900rs
2010 E61
Re: Headers on Chevy G20 w/350
fonman4277 #771505 February 16th 2021 10:00 pm
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End up just chopping the tube. Surely going to get way more flow than a shorty. I can't wait to see the finished setup.

Attached Files IMG_32041.jpg

1987 G20
2019 Z900rs
2010 E61
Re: Headers on Chevy G20 w/350
fonman4277 #778356 June 27th 2021 11:21 pm
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I haven't put them on my "83 yet but I had a set of Doug Thorleys on my '78 with a TH350 tranny...for those having a clearence issue with the Tranny crossmember, I'm thinking there's a difference in the TH350 crossmember and the 700R4 Crossmember in the newer(?) ('83 and up) Vans...food for thought...


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Re: Headers on Chevy G20 w/350
fonman4277 #778357 June 28th 2021 8:01 am
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Yes for the 700R4 you have to cut the collector a little short but there's no reason not to buy the long tubes, any exhaust shop can do it. And shorter headers will definitely have issues with the sides of the engine bay by the floor, and the spark plugs.


1987 G20
2019 Z900rs
2010 E61
Re: Headers on Chevy G20 w/350
DrCaldre #778387 June 29th 2021 12:02 am
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Originally Posted by DrCaldre
Yes for the 700R4 you have to cut the collector a little short but there's no reason not to buy the long tubes, any exhaust shop can do it. And shorter headers will definitely have issues with the sides of the engine bay by the floor, and the spark plugs.

On my 83 with a factory 700r4 I did not have to touch the collector extensions with the older Thorley headers. In fact we extended 2.5" pipe right off the 2.5" extensions for the exhaust. The header collectors had a good inch of clearence under the crossmember. Thorelys are widened out and exit on the outsides of the drop down section of the crossmember. The collector of the thorley itself sits even with the trans crossmember.

Last edited by 1983G20Van; June 29th 2021 12:09 am.

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 on Chevy G20 w/350
fonman4277 #783620 October 11th 2021 3:48 pm
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I put the same headers on my friend's 1984 G20 van with a pypes SGT79S exhaust system and it sounds great, I did have to bend the brake and fuel lines flat against the frame so they wouldn't touch the headers.
I can send you pix if you're interested, too hard to post them on this forum

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