Originally posted by Trucked-up@Jan 5 2004, 03:25 PM
I swapped my 5.3 for a LS1 in my 99 GMC Sierra. I used the truck PCM and 1st used the LS1 intake. I swapped the LS1 intake back to the truck intake, more lowend torque.

The donor vehicle was a 99 TA, suppose to have 305 hp at the fly wheel.

My last dyno, with stock internals, was 250 rwhp and 296 lb/ft of torque. I am having a problem with 8* of false knock so I know there is more power to be gained.

I recommend this swap, it's what should come in these trucks from the factory.

ts99
Ah yes, the typical 1999 model false knock. I'd get that cured and see what kinda numbers you will put down...