Stock dyno run today. 254rwhp/303tq.(locked converter) Completely stock 5.3 replacement GM crate engine with about 8,000 miles. Now I know why this thing is so slow. That was pull 2 because the first stopped at 98 mph, had to get rid of the speed limiter. Now on to find out what parts do what. I have electric fans sitting in the corner, guess that is where I will start.

 

not a bad start.. i would hold off on the efans right now and look into a tune and LT headers

 

Probably will do some tuning tomorrow.

 

is that kind high on the tq? mine put down 327rwtq after my mods and 319rwhp...

 

I think that there is a decent amount of hp left in this thing, judging by the high tq reading, there are some higher rpm gains to be made when I get this to breathe.

 

Not bad numbers. If you have the fans, might as well throw them on.
That's what I'll be doing today...

 

What year model Av are you working on there SS?

I might be able to save you some time and effort....

 

If this is an Avalanche I wouldn't be doing 3rd gear pulls. The stock driveshaft on the utilities is a timebomb at those speeds.

 

I thought that I had heard that the driveshaft was weak, but didn't think anything of it. Now, I think that I should look into one, because this thing wont be a pig much longer. Getting ready to add the BOOST.

 

Trust me, that will be a good choice.