LQ9
The Vortec HO 6000 or VortecMAX is a special high-output version of the Vortec 6000 V8 truck engine originally designed for Cadillac. This engine was introduced in other truck lines as VortecMAX for 2006. It features high-compression (10:1) flat-top pistons for an
extra 10 hp(7.5 kW) and 10 ft·lbf (14 N·m), bringing output to 347 hp (257 kW) and 380 ft·lb (515 N·m). LQ9s are built only in Romulus, Michigan. GM also listed it as based on LS architecture.
LQ9 Applications:
* 2002-2006 Cadillac Escalade
* 2002-2006 Cadillac Escalade EXT
* 2003-2006 Cadillac Escalade ESV
* 2003-2007 Chevrolet Silverado SS
* 2004-2005 Chevrolet Silverado and GMC Sierra Vortec HO Edition Only
* 2006-2007 Chevrolet Silverado and GMC Sierra VortecMAX Option
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HotRod mag has done on on the LQ4 and they had a supercharger on it. They got 700hp with a stock bottom end. You can change the heads to the GM L92's they say their the best stock heads for $800
- 99-00 LQ4s have cast iron heads. Later ones have aluminum heads, the same head as the LQ9.
- LQ4s have a 9 something compression ratio; LQ9s have a 10 something compression ratio.
- LQ9/late LQ4 heads have the same ports and valves as LS6 engines. They have slightly bigger combustion chambers. The LS6 has about the same compression ratio as an LQ9, the pistons are different. LS6 heads will get you over 11:1 on an LQ9, which is probably too much for the street.
- As already said, the LS6 manifold is a direct fit and worth some power, but only at the high end. Low end power is very close to the same between LS6 and LQ9. The LQ9's truck manifold should actually make a little more torque down low.
- LQ4 and LQ9 have iron blocks.
I think they both make good swap engines because they are cheap. The LS6 manifolds go pretty cheap on Eaby too.
Check out this page for some information about the LQ4 vs the LQ9...
http://www.southernperformancesystem...rtec6000.htmll
Also the LQ9 Pistons are Flat-tops and the LQ4 Pistions are Dished.
- LQ9 has a flattop piston and the lq4 piston has a small dish to it.
- The LQ9 has 10.1 compression and the LQ4 has 9.41:1 compression stock.
- The LQ4, generally speaking, is a cheaper engine.
- There is a benefit to owning a LQ4 over the LQ9. This being if you want to go with some sort of forced induction, such as a turbocharger or a supercharger. On forced induction applications, you want to go with the lowest compression possible, and 10.0 is considerably high when thinking about forced induction.
- The LQ9 is a better platform if you're thinking about building an all motor beast.
- So, yes, both have their advantages, depending on what you want to do with the motor. Stock for stock, the LQ9 is a stronger motor.