I want to know what is compriossor ratio. I might to get those one to swap in my 06 silverado. IS it worth? Im currently run 5.3 I fout lq4 longblock from craglist.com. It come with starter,ac,alt, bracket etc. Its off 2003 chevy 2500 hd. It only 64k mileage on it. Its under warranty 12 months. Its only 650 dollars. I already spoke the guy. But give me some info. Before I can make decision. How much horsepower on lq4 6.0L I plan to do for turbo project.

 

That would be a good start.
LQ4 has around 9.4 comp.
LQ9 most of them have 10.0 comp

 

YEah. What LQ4 suppose prove the max hp on stock motor N/A

 

if you plan on going FI a lq4 would be a great motor

 

you will be able to get all the horsepower you want out of that lq4. what determines max hp is how good is the tune and how hard you push it. gonna break the tranny before you break that motor. have fun with it

 

Stock an LQ4 is 300-325HP 9.4:1 compression
The LQ9 is 345HP 10.1:1 compression
Same heads and cam in both engines

Wish I could find a local engine builder to rebuild my LQ4 to LQ9 specs, add some long tube headers, & remap/dyno tune the computer !

 

i have the sts kit with a stock 4.8 and it does ok... but i would love to swap a lq4 in and upgrade my turbo. you will definately be able to make some good rwhp with that motor and a t70 like you mention in you sig. and also like mentioned up top, your tranny will go first for sure if you dont upgrade. if possible get a 4l80 and a good rearend and you will be very happy. id say you should be able to put 450 to 500 to the ground no prob if u get upgraded fuel system, good tune, (preferable dyno tune), and work on your drive train... its definately a project but if you do it right, you will love it. GOOD LUCK and have fun. post it up when you get it done