i have a 92 s10 blazer qitha 4.3l non vortec and was wondering if a tbi spacer really inproves gas millage and performance and is it worth getting one?

 

simple, no, no, and no

 

The fundamental theory behind the use of a throttle body spacer is to lengthen the intake runner to shift the torque curve lower in the RPM range. An engine with a torque peak high in the RPM range can benefit from a throttle body spacer. If an engine already has its torque peak low in the RPM range, or has an almost flat torque curve, there is no benefit. All of the 4.3L v6 engines fall into the later category.

I had ones CNC cut for my old 3.5L Intrepid and gained a solid 2mpg with them. This engine had very little low RPM torque and showed decent benefits from the addition of the spacers.

 

well i have one on my 91 4dr 4.3 and my gas mpg didnt really change but i did get little extra thrust when i installed it with after market breatherlike this one so it could suck more air in to the throttle body my throttle bodspacer is by airaide