What heads on LQ9?

The LQ9 is a 6.0L Gen. 3 small block engine used in GM trucks between 2002 and 2007. For marketing purposes, it was also known as the Vortec HO 6000 or VortecMAX.
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LQ9 Cylinder Heads.

LQ9 Cylinder Head Specs
Cylinder Head Bolt Size 2002-03 (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45

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Are 243 heads on an LS2?

The 243 head is the 01+ LS6/LS2 head. It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports. All three came with 2.00" intake valves, and 1.55" exhaust valves. via

Are 799 heads the same as 243?

They're the same...but in factory form the 243 came on LS6 motors with sodium filled vavles and better springs. early LS2's had either 799's or 243's or a 799 on 1 side and a 243 on the other! via

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