Thread: 89 Chevy TBI to Carb

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Just wondering what all I would need to do to go from TBI to Carburator in my 89 Chevy Silverado

A carburator.


Just kidding ,I will post some links that might help out .Why do you want to change to a carb? I dont think these engine are big power makers because of the heads.The links will give you a few options to make horses with the tbi set up.

http://www.cfm-tech.com/GM_tbi_bolt_...ifications.htm


Check the tech section for switching to carb and other mods
http://www.thirdgen.org/ultimatetbi

I've been looking forward to taking the truck and building a 400 horse engine for it, but everyone says the most I will be able to get with the TBI on top will be around 340 or less, and I would rather get rid of all the electrical stuff.

Originally Posted by dcurtis

I've been looking forward to taking the truck and building a 400 horse engine for it, but everyone says the most I will be able to get with the TBI on top will be around 340 or less, and I would rather get rid of all the electrical stuff.

You can make about 350hp with a TBI but the tune and everything has to be right. TBI just don't support enough flow unless you went with a 454ss TB or Holley 2" bore.

To go from a TBI to Carb, you will need to put a fuel pressure regulator on it so that it only flows 5-7 psi instead of the 11-18 psi currently. You will need to keep the computer so that the guages work and the lockup for the tranny still works. Any other questions, just ask.