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Port Fuel Injection?

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1996 with the intro of the Vortec.


edit: And I hope that I become proven wrong so that no one is misled.


I only say this because a bunch of sites I've went to to get the right answer say that the TPI system (which I'm guessing is what you're asking about) was introduced originally in 1985 for the Vettes and F-body cars, and nothing much more than that except for a part on ECMs where the TPI was mentioned for the C/K GM trucks in 1996. I believe the trucks before 1996 were all TBI injected and I'm not sure that that's the same as port injection.

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