I have a K1500 short bed with a 4.3 liter and it says Vortec V-6 on the valve covers but the intake is TBI. I have never heard of a 94 pickup with vortec heads and tbi but I do know that the s10 trucks and blazers had a cpi vortec. If anyone has some info on this engine please let me know. Oh, and I also was wanting a better exhaust sound so I put a gibson cat-back system on and it seems like a lost some power and the sound it only good to about 2000 rmps and only under load doesn it sound good. If I am cruising it is just a drone and above 2000 it sounds like a drone type of sound. If anyone knows if removing the cat and/or putting on headers would give a better sound please let me know.