kewlbrz

GM Powertrain lists the 2002 LQ4 Head as aluminum for the Vortec 6000 motor, and at around 9.5:1 compression ratio.

GM Powertrain list the 2002 LQ9 Head as aluminum also, for the Vortec 6000 HO motor which seems to be exclusive to the escalde 4x4. Compression ratio is listed at about 10:1

Are there any differences in these heads? I assume there is since Jim Juriga (GM Powertrain Chief) implies that the LS6 design is used only in LQ9.

"The LS1 already was the best overhead valve engine and the LS6 brings it up another level. This is a very high-performance engine perfectly suited for everyday driving. It's safe to say it is a benchmark for the world. That the same exact heads are going to go on the 6.0-liter LQ9 used in light trucks for 2001 says much about the LS6’s durability, as well." John Juriga - GM Powertrain Chief

Jason99T/A

iTrader: (21)

The Escalade has a differerent piston, resulting in more compression.

kewlbrz

[quote]Originally posted by Jason99T/A:
<strong>The Escalade has a differerent piston, resulting in more compression.</strong><hr></blockquote>


Thanks. FWIW I just spoke to a GM powertrain Rep, and he states the aluminum LQ4 had and aluminum LQ9 head are the same.

Slow Z28

iTrader: (19)

yea, in one of the posts, the budget motor buildup post, someone listed the part number for the heads, and it came up the LQ4/LQ9 head. part # 12562319

Chris