hp #s

[okieraptor]

What's the hp #s for a stock 6.0 with a tune. I won't be adding a bunch go fast as this will be in my "tow stuff around, rock crawl, mud, grocery gettin" truck. So I need to keep the low end low.

[Davidmichael]

Not sure if this helps or not, but I had a Trailblazer SS 2007 and it had 395 at the flywheel.

[okieraptor]

Was that with a aftermarket tune or from the factory.

[Davidmichael]

factory tune. with a good tune you should be able to get over 400 hp

[clinebarger]

Originally Posted by Davidmichael

factory tune. with a good tune you should be able to get over 400 hp

Your kinda misleading him. You have a Gen IV LS2. I think hes talking 6.0 Vortec.

[3r!c84]

Originally Posted by clinebarger

Your kinda misleading him. You have a Gen IV LS2. I think hes talking 6.0 Vortec.

very true that ^^^

[Davidmichael]

Yeah wasn't sure what 6.0 so I just threw out the one I was familiar with...

[68GMCCustom]

6.0 iron block with the '01 up 317 aluminum heads came with 300-325hp and 370-380tq....and will make 350hp/380tq easily...with stock trim, a good tune, and cold air intake. Add headers and good exhaust and a good torqey cam, and you might get 400hp/400tq or more....

I'm using a gen IV 6.0L iron block, the newer L92/LS3 style rectangular intake port heads, and will be going the carbureted route. With the cam selected, headers, a 750 Holley HP and the stock 6.0 iron long block (only the LY6 has these large valve heads)...am looking for 500+hp and 440+tq from this combo.

There are lots of genIII iron block 6.0's out there. Most are 300-325hp/360-370tq LQ4's but some are the higher compression 345hp/380tq LQ9. Then the aluminum genIV 6.0 LS2 is a 400hp/400tq motor, and there are the genIV L76 and L99 aluminum 6.0's that make around 360hp and 400hp respectively, but have features like DOD and VVT. My LY6 had VVT but since I'm going w/o the factory efi its coming out and going to another member.

[okieraptor]

Sorry guys I should have said its a 07 6.0. And it will have headers and intake.

Sorry I was tryin to multi task with writing this and the kids and didn't prof read.

[MONTEZ]

A friend of mine has a 5.3L lm7 in his 60' Impala wagon. Bones stock with the MAST M-90 ECM and MAST cam and spring package it made 440hp at the flywheel on the engine dyno.

If you have the rectangle port heads, with cam and springs and a good tune you can see 550hp easily.

If you have cathedral port heads expect around 500hp.

If you can control your VVT then you can squeeze another 30ish hp.

[68GMCCustom]

so then you have the LY6 6.0L motor? with VVT?

[okieraptor]

I have no idea. Its out of an 07 work truck. That's all I know for now they won't be back till Monday and they left today at noon.

Btw is 2600.00 good for the motor trans and transfer case. And fuel pump?

[68GMCCustom]

and all electronics? ECM/TCM/harness/OBDII port? If it's a 2500 (and maybe 3500) its probably the LY6 with VVT and DBW, so you'll need the pedal assembly too.

if you get everything...thats not bad unless it has tons of miles on it.

[okieraptor]

Yes complete wiring with ecm and fuel pickup. Its a 2500 for sure.

[MONTEZ]

Look to see if it has the rectangle or cathedral port heads.

[okieraptor]

How do I tell? Without taking it apart.

[68GMCCustom]

OK....there is a 3 digit number cast onto a pad....is it 823?

bad pic...but gives you an idea. Its on the end of the head, top side

[okieraptor]

K when I go tomorow ill look for it. Thanks guys!

[MONTEZ]

The number will be 317 if it's rectangle port.

[68GMCCustom]

nope....317's are genIII cathedral port heads, like from a LQ4. 243's are also genIII/IV heads as they came on the LS6 and LS2.
823 (and 821?) are rectangular ports

[MONTEZ]

Originally Posted by 68GMCCustom

nope....317's are genIII heads, like from a LQ4.

Oh yeah, I forgot he said it was the newer style. My bad. I even meant to say cathedral port.