1991 TBI and HT 383
 

Anyone know if the stock TBI from a 1991 350 Suburban will power a GM HT383 crate engine? If not, any suggestions on a more HP replacement for a 190hp 350 that still uses the stock TBI?

Re: 1991 TBI and HT 383
 

Here you go, read this.......it will answer all your questions

http://tbichips.com/?page_id=73



I'm doing the same thing to my Suburban next year

Re: 1991 TBI and HT 383
 

If you put the HT383 on the ECM will need to be re-tuned to run it. You can try the chip route. Or you could do something like a megasquirt or EBL Flash. I run the EBL flash system from Dynamic EFI - its a steep learning curve but once you "get it" then its easy to use. I also bought a Wideband O2 sensor which helped a ton for tuning the TBI. I have no idea but I was running about 16:1 AFR at WOT - which is bad news. I have an adjustable fuel pressure regulator so I cranked it up to 16 lbs and a lot of tuning later it really made it come alive.

Re: 1991 TBI and HT 383
 

Have you thought about the erod swap? I know it is pricey, but works excellent.

I am looking at a new off road toy, and it depending on which way I go this engine is in the top 3.

Re: 1991 TBI and HT 383
 

I was on Blueprint Engines website and they have 383 packages for a TBI replacement and they give you a new eprom with the tune in it for the price of the engine. It is about half the price of an e-rod upgrade but only nets you 315 or so horsepower not 430 with the e-rod.