OK, who's the TBI wizard around here???

tnrussell50 · June 16, 2003

I have a 94 GMC 350 TBI and I need to know if I need to do a chip change for a camshaft upgrade.

Any help is greatly appreciated!

MarkD · June 16, 2003

It depends on how radical the cam is. Ed Wright did the one for our '91 Z28 and it only took him 8 tries to get it wright ( ). Best bet would be to get a shop to dyno tune you a custom chip. (~$500 first time, usually discount for repeat customer)

tnrussell50 · June 16, 2003

Hey, good idea! Hadn't thought about that angle. I was starting to think I might have to buy a programmer.

americanmuscleman · June 16, 2003

I think unless your running a cam really close to stock, yes you need a custom chip. My truck runs terrible with the stock chip in it. My cam is something around a 210/215 duration. The company that burned my chip no longer exists.

Ed Wright burns chips, and I heard about a company today called TBIchips.com . You might check that out.

Edelbrock sells a custom chip with their custom TBI cam if your looking at that cam.