I just swapped to a comp 401 in my 5.3 keeping VVT, with a stock converter on the 6l80e, and 3.42 gears. With a 6.2 you might even get away witih the COMP 402. I would definitely suggest keeping the VVT after personally doing this and experiencing no loss of torque on the low end, (SOTP) but with big gains up top. Don't let the VVT tuning scare you, either. After dialing in the air fuel mixture, I kept the stock VVT settings and it worked well for me.

In the tune, basically all you change is how many degrees of cam retard is commanded and a spark modifier for when the cam is retarded. Could modifying these tables from factory settings gain you power and torque? maybe a little, but you will need a dyno to find every last bit of power. For me, factoroy stuff worked great, just get the a/f mixture dialed and the spark tables and you should be happy.

 

Cant vouch for him personally, but I have heard good things about DBR in spring hill. A few guys I work with have used him with good results.

 

http://www.superchevy.com/how-to/engines-drivetrain/ghtp-1303-2011-chevrolet-silverado-ltz-ls9-camshaft-swap/

 

Thanks for the how to but I know the how to part lol. I'm just not very experienced with hptuners. I have a buddy that is and since I haven't heard of any awd dynos in the area Ill have to street tune

 

Did you look at the dyno sheet?

 

Yeah man. The ls9 cam has been my first option for a while now. It's really hard to beat the gain for the money. Plus I can still go fi later like I originally planned when I bought the truck

 

I would have second thoughts about the ls9 cam. The Dyno graph on the install link starts at about 4,000 rpm, and at the bottom you can see below that the stock cam made more toque below that rpm. In a heavy truck you may not like how it feels daily driving. Yeah it will scream up top, but what's the cost?

Secondly there is a guy in this section who reported after swapping to a ls9 cam in his escalade the loss in low end torque. I think he reported wanting to use nitrous to help out down low.

Anyhow, some folks don't mind this powerband, but since you already have VVT I would suggest keeping it to have the "best of both worlds". Great torque and drive ability and good high end power. If you did the ls9 cam you will probably find yourself wanting that higher stall converter and maybe gears.

 

L92 Comp Cams VVT Cam Kit Install - GM High-Tech Performance

****, this is the one I meant to post that tested two comp cams.

 

Well guys I bought a ls9 cam today. But.....Its not final yet lol. I still find myself looking at others. I like the comp 401 but everyone says don't fool with the vvt

 

Just compare dyno graphs in the two articles posted above, the ls9 vs the variable timing cams. Pay close attention to the torque curves and RPM.

IMO the only people who say don't fool with VVT don't understand it. Honda, BMW, and many other manufacturers have been using similar technology years to get wider power bands from small engines. It's a proven technology and theory.

I'll get off my my soapbox now....