I have a Silverado 1500HD 2wd with an LQ4/6.0 engine.
It is going on 150k miles and am planning a rebuild.
I love the truck and want to rebuild the engine when it quits.
I am somewhat familiar with the internal engine but am going to have a shop do the work.
I am looking for about 400 HP.
I am looking for two options.

OPTION #1
I want to use common/stock GM parts off of similar engines and want it to run smooth and still pass smog without killing the gas mileage.

OPTION#2
I want to use GM Performance Parts/Aftermarket parts and want it to run smooth and still pass smog without killing the gas mileage.

Anyone know the best or easiest way to get the results I am looking for?

Anyone know someone who would know?

THANX

 

You can bore your block .030" over, re-use the stock crank, buy forged pistons and rods to build a 370. I would contact Richard at WCCH about heads and cam for your application. Richard can put you in contact with Rex, he will build you a killer 370. There are many on this site who have work from Richard and Rex, it is top notch.

 

Yes put a call in to West Coast CYlinder Head they will take care of you and help you decide what route to go with, since you are on the west coast it will make things very easy for you.