The "Tan Brick" aka my 1997 Express Cobra conversion

[Fast355]

I've read bits and pieces about your G-vans for years...but this is first thread I've seen. haha

What kind of heads on the 383? It sounds pretty similar to the one going in my Camaro.

http://www.gearhead-efi.com/Fuel-Inj...ng-205cc-heads

[dfarr67]

Another question- perhaps answered somewhere else, what do you see as a high value w good efficiency (regardless of dollars spent) torque converter supplier for a 4L60E 2200-2400 stall, 383 non oem tuned port 350rwhp/400tq?

[Fast355]

Ended up going back to a ported stock intake with an AUS 48 lb/hr spider. Put the smaller cam back in a while back too. Just changed out the muffler and tailpipe. Dual 3" in Walker quiet flow muffler and matching 4" tailpipe for an 01-06 3500 HD with a 6.0L or 8.1L fit my van like it was made for it. To me it is very quiet for a 500 hp engine and a bit of a sleeper now.

https://youtu.be/zJBiw3xkiYY

https://youtube.com/shorts/bq8CAvqnubU?feature=share

I also swapped a P59 Green/Blue into it a while back. First fireup after the 383 went back in on the Mexican 2005 L31 GMT800 file base tune with injector size, displacement and MAF edited. Had to do a good bit more tuning. Torque management was pulling a ton of timing out of it. Open headers so it is nice and crackley.

https://youtu.be/FzEDpuSIwJc

Idling with a 4" MAF.
https://youtu.be/iEn1Ht6Ta-s

Testing the 6,200 rpm rev limit open cutouts.
https://youtu.be/J4v4Z9rAKio