Hi all, I have a 02 Vortec 6.0 in my gmc sierra 2500 4x4 ext. cab pickup. Everything is stock and i get roughly 13 mpg around town. I'm seeking better mileage and performance with the most bang for the buck. I have been considering a volant cold air box, maybe longtubes, changing the heads to Z06 343's to raise compression and also either changing to a torque producing cam or crane 1.85 rockers. What do you think might be best based on whats proven to work? Thanks in advance. Dave

 

All of your answers are here:
https://www.performancetrucks.net/fo...d.php?t=395748

 

Thanks i've read that before and its quite generic. I'm asking for those that have swapped heads and or cams or rockers to chime in on their gains. I've done virtually everything possible to my vette including supercharging however this truck needs torque and mpg as its a daily work truck. Thanks again for responding. Dave

 

i have a 00 LQ4 6.0 and i have been only getting 14 MPG out of it, i have shorty headers, the open element KN and hypertech on it. it made it run a lot better and better in the mud but as much for gas. i am sittin on 33s mud tires though

 

Thankfully all these ls style motors are generic within thereselves and the gains/results you see won't differ very much from each motor. No need to swap rockers.

 

Thanks for the info.

 

I hear ya, i guess i might try swapping the heads along with long tubes and a better air filter to start off in the right direction. I'll get it dynotuned and see where it ends up before and after. Thanks, Dave

 

Rockers aren't really worth it IMO. The best thing you can do for gas mileage is a good tune and a cautious right foot. Look into one of Vinci's cams like the 210/218 version for good torque off the line. The heads would be a good idea for raising compression as well. Also do the normal stuff of course like a CAI and free-flowing exhaust with long tubes.

 

Thanks for the info StrokerAce. Thats just the info i was seeking on bumping up the compression with a head swap and a good cam choice.

 

dave,

The best way to get tq in that 6.0 is doing a blower,

Id be happy if our 6.0 truck got 13 mpg. I ave 11. and thats including 30 miles a day of interstate driving.

I have been told the computer's in these trucks are not the best in the world. There are a lot of "adjustments" that can be done with the timing and fuel.. Also the tq management can be adjusted. We have data logged my truck and it has pulled 70% of the power before on it..