LQ4 vs LQ9: What's the Difference?

The GM LQ4 6.0L and the GM LQ9 6.0L differ in compression ratio, factory rating, model years. The table puts the factory specs side by side; each engine's own page has the full specs.

Specs side by side

	GM LQ4 6.0L	GM LQ9 6.0L
Engine	GM LQ4 6.0L (Vortec 6000)	GM LQ9 6.0L (Vortec HO 6000 / VortecMAX)
Displacement	364.1 ci (5.97 L)	364.1 ci (5.97 L)
Bore × stroke	4.000" × 3.622"	4.000" × 3.622"
Cylinders	8	8
Compression ratio	9.4:1	10:1
Factory rating	300 hp–335 hp	345 hp
Block	cast iron	cast iron
Heads	aluminum	aluminum
Rod length	6.098"	6.098"
Deck height	9.240"	9.240"
Weight (approx.)	540 lb	540 lb
Fuel	gas	gas
Model years	1999–2008	2002–2007

Where versions of an engine differ, the table shows the range across them. Ratings are the makers' published figures.

Which cars got each engine

GM LQ4 6.0L	Years
Chevrolet Silverado HD	1999–2007
GMC Sierra HD	1999–2007
Chevrolet Suburban	2000–2006
GMC Yukon	2000–2006
GMC Sierra 1500	2001–2007
Chevrolet Chevy Van / Express	2003–2008
Hummer H2	2003–2007
GMC Vandura / Savana	2003–2008

GM LQ9 6.0L	Years
Cadillac Escalade	2002–2006
Chevrolet Silverado 1500	2003–2007
GMC Sierra 1500	2005–2007

More

• GM LQ4 6.0L specs
• GM LQ9 6.0L specs
• All engine comparisons