![]() ![]() These pre-Vortec engines used hydraulic non-roller camshafts. The 5.7L TBI engines were produced from 1987 to 1995, with power levels that ranged from 185-210hp. The 7.4L version aptly resided in 454SS trucks and production ran from 1990-1993. TBI-equiped motors included the 4.3L V6, 5.0L, 5.7L and 7.4L engines. GM introduced a redesigned body style the following year in 1988, which would last 11 years from 1988 to 1998. ![]() This was one of the first mass-produced fuel injection systems on GM trucks starting in 1987 for the final year of the square box body style. Feel free to offer suggestions or add your own Q/A entries to the appropriately entitled. Hopefully, this thread will serve as an important resource for those of you who are new to OBS trucks and serve as future reference for the FSC “old timers”. I have used a running FAQ-type commentary to minimize reading through a ton of posts and so that I can share with you my experiences and expertise. I have not limited myself to this board and have included very useful discussions/info from other websites. Well to lessen repeat questions, I've attempted to gather together some great discussions on TBI- and Vortec-related performance topics into one big post – perhaps the ultimate post. Although the forum has a search feature, it is often easier to just ask your question. I’ve been on the forum long enough to notice the same questions popping up again and again. Copied and pasted this from another site tons of awsome info ![]()
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