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#1
06-02-2005, 07:57 PM
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1989 GMC Suburban Modifications
I recently purchased a 1989 GMC R2500 Suburban with a 454. Most of my experience is with classic Mopar vehicles. That said, I would like to get some suggestions on what I can do to get this bad boy running at its best. I noticed that it only has a 2 barrel (fuel injected) carburetor. Is this the best way to go (again, bear with my in-experience)? I also noticed that it has single exhaust... what an injustice
 What type of manifolds/exhaust performs best with this type of engine? Oh, any other performance enhancing suggestions would be greatly welcomed. 
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#2
06-03-2005, 01:58 AM
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Re: 1989 GMC Suburban Modifications
Will this truck be registered in CA? If so, everything you do it must be CARB approved or you will not pass smog.
Edelbrock does make a Multiport Injection kit for your truck (8 injectors). I am not sure if the stock 454 heads flow real well or not (I know the 350 TBI heads are not that good). The Edelbrock kit is not cheap at around $1100. A new cam is probably needed to take advantage of the Multiport injection along with some computer mods. If your truck only has one cat, then you are not allowed to add another one; therefore, you can only go dual exhaust after the cat. //2000CAYukon
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