im going to be putting in the lt4 hotcam. am i going to need a custom prom with this? what would happen if i didnt get one?

 

Your car will run, but very poorly. And DEFINITELY no where near it's potential performance. What other mods are you planning btw? An LT4 Hotcam on a stock motor will have "mixed" results. It really needs intake mods. Some better heads will also help.

 

I'll second that. I'm just beginning to tune my motor after LT1 intake, heads, and LT4 HOT cam kit. There's no way I'm getting the power out of this motor that I should. But like I said, I just started tuning.