No 6.0l, not in that truck anyway.My 04ecsb has a heads/cam 6.0l.
The truck is a 2000 RCSB Stepside with a 5.3l 100%stock motor. stock cam stock heads you get the idea.
it has the normal bolt on mods and 4.10 gears, ran it at almost full street weight only thing i did was remove my sub box and it ran the 13.7 @99mph and this was with a crap tune that i did myself and i'm extremely new to hptuners.
If i remove some weight for a track pass and dial in a real tune haha it should go 13.5's easy.


Just since it came up...here is the video of the truck when it went 13.7's.
http://videos.streetfire.net/video/1...53l_153051.htm

 

Very nice, if you haven't tuned your spark tables I can send you one of my tunes. I run about 28* at WOT up top.

 

If you wanna watch i added a video link.
I have the spark kinda tuned a little...but basically i ahve not done the ve tables are anything like that and the spark table kinda jumps to like 29 then drops back down to around 26 dropping in .5 and 1.0 increments than starts cimlbing back up tp 28degrees....so ya they are basically a mess as is the whole tune really.

 

I had a couple wires in the engine bay switched around. When I got my engine, the harness was chopped where the o2 plugs would have been. I spliced them together with my old engine harness and had the rear purple o2 wire in the front and the front in the rear. Seems to run alot better now. Service light hasn't gone out, but they tend to take a while. I guess we'll see. I probably should swap out my spark plugs after it running like that tho. Are these tr55 plugs the best to put in. I heard alot of people like to run them.

 

they are ok and will do the job...however the better plug to run would be the stockers. They are a much better plug and thus cost a bit more as well.