scubiesteve

So I have a 2008 4WD Silverado with a 4.8l, 107,000 miles and the valve train is making some awful noise. I've had several shops look at it and the consensus is that I either have a sticky/stuck lifter or it ate a camlobe. Either way, at 56,000 miles Chevrolet replaced all 16 lifters due to valve-train noise under warranty and now it's back. I'm done with this 4.8l and tired of sinking money into this engine, so I'm thinking of the ATK LQ4 6.0l.

I know the accessories IE: alternator, waterpump, A/C, ETC. will bolt-on directly but I have heard conflicting reports about the intake manifold bolting directly up. I know I will need a tune, injectors from an 8.1L Chevy, and to bring over the 4.8L flywheel. I'm also thinking about a FLT 4l65/70e stage 5 to handle the 6.0l. I already have 33" tires and 4.56 gears with Detroit truetrac in the 10 bolt.

I tow our RV and ATVs with this truck so I'm just looking for some extra power without going too crazy.

So with all of this taken into account would the 6.0l be a great engine swap for me or would I be better off just building the 4.8l. The $3700 is very enticing and it wouldn't hurt to have the extra power for towing.

If I do the 6.0l I want to do LT headers, magnaflow exhaust with an X-pipe or H-pipe, and a tq converter to match the engine/tranny with the 4.56 gears and still be able to tow/DD.

Link to the engine: ATK High Performance Chevy LQ4 6.0L 460 HP Crate Engines HP93 - Free Shipping on Orders Over $99 at Summit Racing

Specs:

Stage: 1
HP: 460
TORQUE: 470
Engine Type: Chevy LQ4/6.0L
Displacement (cu.in):366CI
Block: 6 Bolt Main
Bore / Stoke: 4.030 X 3.622
Crankshaft: OE 24 Tooth
Rods: Stock
Pistons: Hypereutectic
Rings: Moly

Camshaft Type: HYD. Roller
Camshaft Lift: CUSTOM
Camshaft Duration @.50:CUSTOM
Cylinder Head Type: OE Reman Aluminum
Chamber Size: 71cc
Valve Size: 2.00 IN X 1.55 EX
Intake Runner Volume: OE 210cc
Compression Ratio: 9.5:1
Rocker Arm Type: OE Steel
Rocker Arm Ratio: 1.7:1
Sheet Metal: Not Provided
Recommended Fuel: 91 Octane
Ignition Timing: 36 Degrees Total Advance
Max RPM: 6000
Warranty: 24/Unlimited
Dyno Proven: YES


Any help will be greatly appreciated.....

FFDP

iTrader: (2)

You might want to read up on the major changes from the GEN 3 motor to the GEN 4 motors. That LQ4 is a 24x compared to a 58x crank trigger, different knock sensor locations. You would have to buy extra parts make it work.

Wolftrk99

iTrader: (5)

Youd be better off with an l96 or something that is gen iv to start with...

scubiesteve

I would love to but then I run into the problem of VVT which my 4.8 does not have.......

Wolftrk99

iTrader: (5)

You sure about that??? Vvt is two wires, and basically being turned on in the tune... I have an 11 express im getting ready to drop a 4.8 in and its got vvt...

scubiesteve

Positive, VVT was not introduced in the 4.8l until 2010, my truck is a 2008.

Wolftrk99

iTrader: (5)

May almost be worth adding it then.... Its two wires and activating it in the tune.....

1994Vmax

iTrader: (4)

Or just don't run the VVT the LY6 and L96 have and swap the cam.... pretty simple. You can harvest your 4.8's timing cover. For that matter if you don't want the L92's which I personally wouldn't, just take your 4.8's entire top end and put it on a Gen IV 6 liter short block...... It would easily be a more powerful combo than that LQ4 thing they are offering. Someone here has run that engine in a Gen 3 application and it's just a bone stock LQ4 with a cam and makes about the power you would expect a bone stock LQ4 with a Vinci Trucker cam to make.

Wolftrk99

iTrader: (5)

The gen iv 4.8s are running 799/243 heads..... Wish i had a set of heads laying around i have access to a set right now.....

1994Vmax

iTrader: (4)

Yep..... and the good 90 mm intake too...... I get entire engines for $100 or less and harvest a few of those heads and intakes lol.