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Ed Wright · 12-14-2017, 04:43 PM

Might have trouble towing a race car with it. Sorry I did not notice you put 1999in your message. Guess I need to pay more attention.
The '99 Vortec 350" is more powerful than the 1995 and older 350"s. The computer can be programmed for roughly 24 to 25 rwhp, and 32to 35 ft lbs more torque at the tires, on 87 octane fuel. I have tuned many of those. I have never seen one with an Allison trans. I had an '04 36' Class A motor home with the GM 8.1 Liter gasoline engine, and it still had a 4L80E Trans. The 350" with an Allison is surprising. The Allisons shift a lot, but the gear ratio spread in pretty close, so the engine should stay in it's power band better than with a 4 speed. I have had 8.1L trucks with both transmissions on my dyno. The Allison equipped trucks showed a little less power to the tires. Plus & minuses to most things, I guess.

Easy to tell if it is a 6.0L or 350". The 350" still has a distributor in the back.

12-14-2017, 04:43 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: Motor home with 350 ? Might have trouble towing a race car with it. Sorry I did not notice you put 1999in your message. Guess I need to pay more attention. The '99 Vortec 350" is more powerful than the 1995 and older 350"s. The computer can be programmed for roughly 24 to 25 rwhp, and 32to 35 ft lbs more torque at the tires, on 87 octane fuel. I have tuned many of those. I have never seen one with an Allison trans. I had an '04 36' Class A motor home with the GM 8.1 Liter gasoline engine, and it still had a 4L80E Trans. The 350" with an Allison is surprising. The Allisons shift a lot, but the gear ratio spread in pretty close, so the engine should stay in it's power band better than with a 4 speed. I have had 8.1L trucks with both transmissions on my dyno. The Allison equipped trucks showed a little less power to the tires. Plus & minuses to most things, I guess. Easy to tell if it is a 6.0L or 350". The 350" still has a distributor in the back. __________________ Ed Wright 4156 SS/JA Last edited by Ed Wright; 12-14-2017 at 10:10 PM.