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Old 06-20-2017, 11:02 AM   #1
hoser1869
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Join Date: Jun 2017
Location: Portland Oregon
Posts: 2
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?
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Old 06-20-2017, 11:11 AM   #2
kwmech
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Join Date: Mar 2003
Location: Colfax-California
Posts: 4,721
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
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Old 06-21-2017, 10:13 AM   #3
Mattchu60
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Join Date: Jan 2014
Location: Swaledale, IA
Posts: 234
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.
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Old 09-06-2017, 10:44 PM   #4
Ziegelsteinfaust
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Join Date: Dec 2012
Location: Chino Hills
Posts: 1,333
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.
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Old 09-18-2017, 09:18 PM   #5
Ryan Hubbard
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Join Date: Aug 2007
Location: Mission Viejo, CA
Posts: 203
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.
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