I was wondering about how much Hp and Tq to expect from my LT1 to LT4 conversion, i'm also boring the block out to a 355 and installing LT's, y-pipe, Crane Fireball HI-6 ignition, and 30 lb injectors. I have forged 10.4:1 pistons

 

Anyone?

 

Any other mods you are leaving out such as a CAI or catback? It's kind of hard to say what kind of power you would be making from your brief description of your mods, I assume there are others.

 

I also have a CAI, k&n filter, my current exhaust(manifolds, gutted catalytic, to a single flowmaster) not sure what i'm going to do for the last half of the new exhaust yet

 

also going with a 58mm TB, the LT4 kit has the LT4 hotcam, and 1.6 RR's.
It's a six-speed if that helps out any

 

With good programming or dyno tuning, the LT headers and a good flowing exhaust (flowmaster isnt the greatest IMO) I would guess it should making somewhere in the area of 350rwhp/370rwtq. It's hard to tell though, your best bet would be to get it dyno tuned when it's done and then see how it does.

 

Thanks for your help, I think i will have pcmforless tune it.

 

Brian (PCMforless) did a great job on my tune, I'm actually only about 30 minutes from him. He's a nice guy and very good at tuning the hotcam. Good luck with it, let us know how it all works out.