Alright so I've been thinkin about doing a 350 tbi swap into my 95 jimmy 4 door with the 4.3 cpi. It has about 4-5" of lift and 31" tires. I understand the concept and have found plenty of "how-tos" for this swap. My main question is, what kind of results will I yeild? Right now with the lift and tires its pretty bogged down from the get go, but I can get 20mpg highway. Will the 350 get about the same or better mpg since its in a lighter vehicle? what about performance? If anyone has a 4 door blazer with the 350tbi stock please let me know what kind of results you got.

 

SomeYou may get an increase in power depending on what vehicle the engine was pulled from. MPG is usually relative to the amount of throttle you give it and the gearing. It's possible though.