I need to know for sure what cam my 88 GTA 5.7 has. I'm considering a cam upgrade, but based on it's current performance, I need to know how much hotter to go. IS THE CAM DATA FOR 88-89 350 AT accurate on the thirdgen tech data section? Or is it possible that I have the '87 cam??? It runs outta steam at 5 grand so I was skeptical that it had the 207/213. Thanks guys!!!

 

AFAIK that cam info is correct...

The cam isn't why your car runs out of steam, it's the fact that it's TPI. TPI stands for "Tuned Port Injection", remember; it uses acoustic tuning (based on the speed of sound and the length of the runners) to produce enhanced volumetric efficiency in a narrow band, roughly from 3200-3900 RPM, at the expense of reduced volumetric efficiency at higher RPMs. It responds to mods very differently from a carb or even a TBI setup, because of its tuning effect. You can easily make the car go slower by sliding in too much cam.

With a stock-runner-length TPI, 214° on the intake is about as far as you want to go; and you need to run at least 114° lobe separation if you use a cam that large. ANy larger than that and you're into custom chip land; and beyond 220° or so, you'll definitely begin to slow the car down without significant intake mods.