i wanna put in a new cam in my 5.3 silverado ext. cab its my dd so i want sum more gain but i dont wanna sacrifice gas mileage and i want sumthing that will work with the computer in the truck

 

You will have to tune for any cam you swap into.
As far as gas milage goes...horsepower costs. You don't have to give up a lot of economy but honestly if you wanting to make more power you should be willing to sacrafice a little. You don't see many 500hp prius's around and there's a reason for it

 

I put a 205/212, .540/.540 114+4 Cam Motion cam into my 2003 Avalanche that gave it 15-20 RWHP all over and a nice punch right off idle. No tune needed. Lingenfelter has nearly the exact cam (LS1-GT2), and with a 116.5 CL, it would have a stock idle.

 

oh alright then so what cam size would be a good one cause i dont really know what the numbers mean on the cam sizes and all what would you say trev

 

Read this....https://www.performancetrucks.net/fo...d.php?t=387763

 

oh alright good info

 

I've got something different. And yeah new to the site as well. Sorry bout that. I also have the 5.3, but i have a single cab stepside 2wd '04. I'm wanting a lill different. I kinda have it planned out. Cold air kit, Pacestter longtubes, Yank 2800 stall converter, custom XXX tune, N2O 75 shot wet, and with the cam... I'm stuck. I found a cam out of a LS6 car but its 224/224 duration. And my builder said i wouldn't gain power until 3k rpms, then more then likely roast the tires. So what cam would be a nice one? Someone mentioned a Comp 218/222 but i dunno the lift. Thanks for the help.