Thread: When Did GM Stop Using TBI?

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I am in the very early stages of planning a build. I want to find a wrecked Chevy with a 350 auto that has port injection. I know that in the most recent engines they have gone to individual coils at each plug - I want to avoid that. I have in mind to buy the wreck, remove the engine, transmission, and complete wiring harness then part out or scrap the rest.

What year Chevy's had port injection with a single coil? Thanks for your help.

Turkey....
You are confusing Tuned Port Injection with Throttle Body Injection. Tuned Port Injection came on 350 Corvettes, Camaros, and some Impala SS models. The TPI is the one with the plenum tubes exposed and the throttle body at the front.

On the other hand is TBI (throttle body injection). This injection is a interim step up from the carburetor. It kinda looks like a carb and the "injection" is done inside the throttle body itself.....not a port injection in any sense of the imagination.

Throttle body injection is inexpensive and somewhat crude relative to port injection....but it's still better than a carb for stuff like off road vehicles because there are no floats.

Go to Fuel Injection Specialties web page
http://www.fuelinjection.com/
for a good explanation of the variations of tuned port jnjection

mike in tucson

Perfect. Exactly what I was looking for. Thanks!

Turkey, more info than you need:

The engines with the coils on the valve covers are LS series motors. These include the engines in the newer chev trucks, corvettes, and the later camaros. These engines have NO distributor, eight coils and have nothing common with the older 350 engines except for the bore spacing of 4.400 inches center-to-center.

Back to the tuned port injection.... tuned ports look cool, have really good low end torque and are getting cheap to buy since they have been out of production for about 10 years (has it been that long already?) They also are relatively low profile so they fit under lower hood lines. Just like other injections, they use a computer (ECM). There are tons of aftermarket wiring harnesses and computer mods that make it easier to install in your application.

mike in tucson