3/9/2023 0 Comments Tbi performance mods![]() ![]() Also toss the choke collar,if you run the open element filter with flat base, that is between the TBI and the air cleaner assembly. Or you can run with a 3″ tall 14″ diameter open element filter with a flat base. The baffle on the TBI Truck is too small for a 2.8L V6 much less a 5.7L V8. This modification does typically require changing to the 350 5235206 truck injectorsĤ. Heads, vortec 4.3L heads are cheap and easy to come by but it does take a little modifcation to make them work with TBI but its worth the effort. have a nice little supercharger kit that is reasonably priced and will give you V8 power from your little V6.ģ. 15hp gained from its better cam and 30hp from its better heads.Ģ. The Vortec 4.3L came with a better camshaft in the 201/207 duration range so just another reason that Vortec 4.3L is better, making 45hp more than the 150hp TBI 4.3L. 050″ tappet lift (intake/exhaust) is 179/194 and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is. The cam in the TBI engine is just plain AWFUL. So START with a vortec 4.3L and run TBI on it.ġ. CAMS are expensive and on a TBI 4.3L is only going to gain you about 15hp from 3000-5500 and lose that much below 2500 rpms. GM ran out of valve covers in 1993 and put vortec 4.3L valve covers on both engines. Main Recommendation is dont touch the TBI 4.3L and if your 1994-95 4.3L has Vortec valve covers that does not make it a vortec engine. I hope you find the information below helpful. There are some things you can do to improve on it. While I am not a big fan of the GM 4.3L V6 engine. ![]()
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