i have a 2010 silverado 5.3 and i am looking for a good and agressive cam for it that will give me a good amount of rwhp.

 

Texas speed low lift 112 Lobe separation. What else do you plan on modifying? Are you removing the displacement on demand?

 

That's too small- go bigger...........

 

You can go with the tsp stage 4 truck cam. 222/226. You will need a stall with it.

 

i have a completely stock truck right now, i´m getting long tube headers a bulldog tuner chip; and i heard a ls6 intake manifold can fit on my truck.

 

would it be good on the stock block i have at the moment?

 

LS6 manifold is a no-go. Wont fit without a belt re route (~$100) and fuel line mods (~20-150 depending on your ingenuity and where you get parts), no performance gain over a truck intake. Truck intake makes more torque, flows at least the same and already fits no problems. Some ppl, such as myself, firmly believe the truck intake out flows the LS6

Long tubes get a thumbs up. I am happy with my TSP ones. I added V-bands to them, but they fit my 4wd no issues.

Save the money on the "chip" and get a custom tune from a tuner, preferably on the dyno

All the cams you can find for gen3 motors will fit the block, but YOU MUST do valve springs, and for crazy cams check piston to valve clearance. The crazier the cam, the more money you spend running it; fuel, stall, springs, tune, etc.

I have a stock head (706) gen3 5.3 that just cracked 302whp NA with very basic mods:
Stock heads, intake, TB
TSP 212/218 112LSA (usually touted as the biggest suggested on a stock stall truck)
LS6 springs
eBay 4" intake
TSP 1 7/8 LTs (I suggest 1 3/4 for you, I built my system to support a 408, rumor has it the bigger the primary, the more off idle torque you lose)
3.5" exhaust
OEM 6.2 muffler
Cat delete

 

Keep your stock int, works best. Do you have VVT or DOD/AFM ?

 

BTR has a NSR(no springs required) cam now, that would be the best bang for the buck. It would still require a tune.

 

I would just do springs. The LS6 springs can be had under $60 brand new, you can rent a tool or buy the comp tool that pays for itself if you do a second spring swap in another motor.

Everyone has an opinion, and the NSR might be a good option, but I wouldnt leave 30-40hp on the table to simply avoid an hour of work with the tool and a leak down tester.