6.0 with LS3 engine combination

[SSLOW6.0]

My goal would be around 500 hp. I have a high mileage LQ4 that will need rebuilt is what I have now. The usage for the car at this point is a driver / cruiser but I want it to be super reliable to be able to take on longer trip so reliability is very important. I am concerned with the wiring to make it work. I don't want a highly customized wiring harness that has the potential to be troublesome.

What year LQ4? is it a Gen III or Gen IV Motor? If its a Gen IV you should be able to a DBW GM crate motor harness and just get it re-tuned for your application. If not you're looking at a custom harness from one of many reliable vendors (painless, PSI, EFIsource etc) To get 500 hp (im assuming crank hp) you're going to need some good cathedral style heads and close to 11-1 compression. You can reuse the factory LS crank, they are plenty strong, but you may want to look at upgraded rods and a flat top piston. I'd recommend the GMPP CNC LS3 heads and an LS3 or L92 intake (depending on vehicle weight and where you want your torque) If you're going to go with a rectangle port head, I'd also recommend going .030 or .040 over to help un-shroud the intake valve. As far as cam grinds go, Talk to Texas Speed and Performance, they can set you up with lifters, cam and valve springs that will work with the combo you have. The wiring is pretty simple in my opinion, but I'm a techie. Remember since LS motors don't have a distributor (unless you get one of the funky aftermarket covers) you're always reliant on some form of computer for spark, whether you do a carb or EFI. Personally I trust the robustness of GM's or even DIYautotune's computers before I trust aftermarket MSD junk, but that's just my experience with MSD.