How about this engine from ATK? It's the LQ4 HP93. Has anyone put that in a 99 nbs? Summit Racing thought I might need an intake from an 01 or newer and possibly modify the wiring harness.

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

Link:
GM LQ4 6.0L 2001-2007 460HP: High Performance Engines | ATK Custom Built Crate Engines

Thanks

 

Just bolt it in and go

 

Yeah? No mods required?

 

you will need to swap everything over.

tune will be a must and injectors



longtubes, intake, cool looking parts are up to you.

 

I have a Nelson tuned PCM right now. Wonder if they've tuned that engine b4...

 

Look at thompson or hke. That enigne is stock with a very mild cam.

FYI, I got my afrs and lq9 longblock for a $100 less. They are used though.

 

Nice. Yeah, I was going to call Thompson. The power ratings are right where I wanted to be with this one though. what are you making with yours?

 

I understand not everyone wants a max effort engine. And no doubt that engine would run well and be fun to drive. But they could've at least used arp hardware and 243s for the price.

My engine's numbers were disappointing. It was pulling vacuum on the intake after the heads went on. Only dyno'd 404/408. It still runs good. Kind of at a crossroads on what to do next with it though.

 

How big would you go with the injectors?

 

You could use the 8.1 truck injectors which plug right in and the tuning changes are easily made. Make sure your fuel pump is up to the task.