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I have noticed that the cast iron headed 6.0s have a lower compression ratio than the aluminum but both heads have the same cc combustion chamber. That makes think that the iron headed ones have more of a dish than the aluminum ones. Is this correct, I have been wondering this for a while now.

Casting Number 12562317 or 12572035

2001-2004 LQ4/LQ9 equipped truck
Material: Aluminimum
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve: 2.00 inches
Exhaust Valve: 1.55 inches
Part Number: 12572035

Casting Number 12561873

1999-2000 LQ4 equipped truck
Material: Cast Iron
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve: 2.00 inches
Exhaust Valve: 1.55 inches
 

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hope this helps a little
http://www.carcraft.com/projectbuild/116_0704_lq4_short_block/viewall.html

http://houstonperformancetrucks.com/showthread.php?12544-GM-Head-Casting-Info-with-flow-numbers

Casting Number 317, 035
Head: 2001+ LQ4 and LQ9 6.0 Liter Truck
Material: Aluminimum
Part Number:
12562317 -LQ4
12572317 -LQ9
12572035 -LQ9
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1 LQ9 Flat top pistons
Compression Ratio: 9.6:1 LQ4 Dish piston
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
 
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