[68jewel]

Originally Posted by bbadfred

From what I have heard and read is that the truck intake has better torque which would be better for street use? I was lucky enough to buy a complete LQ9 6 liter which has those heads and 1/2 point lower compressin alowing lower octane (cheaper) gas. The LQ9 has 345 hp and 380 ft lbs of torque. According to John Spear with his harness and reprogramed pcm and using no converters and down stream o2 sensors you gain an additional 10-15hp and 10 ft lbs of torque with a free flowing 21/2 inch exhaust.

You are correct that the truck intake has more torque because it is taller. Hence, taller runners for more air intake. I bought both of my LS harnesses and ECU's from John at Speartech. He is a very knowledgeable person and knows his stuff. I advise anyone doing an LS swap and needs an ECM or a harness to give Speartech a call. Lastly, the LQ9 is capable of more HP & torque than that if you do a mild cam upgrade.