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Re: Header availability in 2024 for '88 G20 with SBC and TH700(!)
DrVan #813498 May 21st 2024 9:04 am
Joined: Apr 2004
Posts: 2,043
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Speaking of headers, I was just watching this video and found out Factory headers on a Chevy Van are a thing. Didn't know they existed before.

On an 86 Beauville.

Go to 49 minutes.....

https://www.youtube.com/watch?v=4ZK3kjiDUpQ


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: Header availability in 2024 for '88 G20 with SBC and TH700(!)
DrVan #813502 May 21st 2024 11:45 am
Joined: Apr 2007
Posts: 350
Likes: 80
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G Van Man
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It is hard to say any header will fit with 100% certainty. Variances in manufacturing can cause issues even on vehicles they are intended to fit. I have run across issues in the past like that. The specific camaro headers you listed also look too long on the passenger side. It is a shame that Thorley no longer makes the TH315Ys though, they fit like a glove and no issue with the crossmember because they exit outside of the crossmember. I know the C10 header did not have crossmember interference and the 49100 are shorter. If it were not for the noticeable torque loss running them, the Hooker SBC manifolds are also excellent. For the cost involved and the risk of something else not fitting, might be the best comprimise for you. Just throwing out that option too. I was able to buy the L31 350 Vortec heatshields new from GM when I had them on my 87 too. The 49100s fit my V8 Astro like a glove and I see no reason they would not work as I have seen them on a G-van in the wrecking yard but they are also more of a mid-length and I am not sure that they are available coated. The 49100s have more starter clearence and less tubing to heat up your engine bay which is a definite plus. Here are the manifolds I mentioned, can also get them coated or with the raised D-shaped fast burn style exhaust ports.

https://www.summitracing.com/parts/hok-8525hkr?seid=srese1


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'
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