I recently completed a 6.0 4l80 swap on my 02 reg cag Z71. The engine is a low mileage stock bottom end with patriot 317 heads and comp cam. The cam specs are 226/222 on 115. Tranny is pretty much stock with a shift kit and a Circle D torque converter(3500). Now for the disappointing part. I recently had it tuned and it runs and drives great , but just feels really slow. It will not even peel out from a dig. I know that the totally stock exhaust and stock injectors are not good for performance, but I still expected more. My totally stock 5.3 Extended cab with a yank 3000 ran much better. This build is not ment to be NA., it will be turbocharged soon. I would hate to bolt the turbo on and it be this boring down low. After all that why I chose the 4x4. Any thoughts?

 

It should be able to easily peal out no problem my 4.8 with just intake exhaust and tune will smoke the tires all day from a dig.

What gears and what tires are you running? and post a pic!

 

Wondering did you degree the cam ? I had one recently 6 degrees out and had to get an adjustable timing chain\gear set or fight the battle of returning and waiting weeks.

If it was out a lot, you could certainly have a Dog Motor. Just food for thought on what could be a long list of possible things to make it slow

 

I have 3.73 gears and the same wheels off the previous truck(basically sss wheels). No, I did not degree the cam.

 

Combo is all botched up so I'm not sure what exactly you're expecting. Even a fully functioning 6 liter setup n/a is a turd.

Also, if you're not familiar with the 80e, going from a 60e is a dramatic difference in 1st gear due to the different gearing between the two trans. It's like compared a sprinter to a slug off the line, you need power to light it off.

Who's tuning it?

 

patriot cams are junk
patriot heads suck and false flow numbers

80e is killing you big time

unless your over 500 rwhp then a 80e hurts ya

 

Yea. I know it's not a good NA combo. That's not the route I'm going anyways. It will be turbocharged. Allen Nelson tuned it. I forgot about the 80e differences.

 

[QUOTE=George C....;5303988]patriot cams are junk
patriot heads suck and false flow numbers

80e is killing you big time

unless your over 500 rwhp then a 80e hurts ya[/QUOTE

It's a comp cam and patriot heads. I would not buy these parts today, but it's what I had laying around from an abandoned build back in 04. Just trying to run what I have.

 

The first gear in the 80e is 2.48 and the 60e is 3.06 or something, so that's a huge factor on your dig runs! The truck should be pretty lively after you get the turbo on! I would run a lower gear either way, at least a 4:10 maybe even lower depending on what size tires you run

 

Trans is a lot of it and I don't like those big wide center cams like that for a heavy truck, and the reverse split is not helping power either. I run the triple 12 in my lq4 turbo 4x4 and love it. It will kill 33'' BFG's from a dead smash with zero boost.