For clarity's sake there is a difference between the tbi and Vortec applications, but it's a simple fix. The Vortec motors have 2 O2 sensors where the tbi motors have only one. I know this is true for the 454's, I'd imagine it's the same for the small blocks. Structurally the headers fit the same on all GMT400's (squarebody headers will NOT fit), you just need to make provisions for the other O2 sensor.Thanks. I am hoping to hear from someone that has a 1994 4wd exactly like mine. There seems to be some confusion on this, as I've heard the headers for 1996 won't fit the 1994 4x4. Hoping to learn the whole scoop here.
I saw one YouTube video where he showed inteference with the diff plus the driveline, and swore long tubes won't fit.
???
Vettepilot