Here is a list of a few casting #'s:

853 97-00 aluminum 5.7

241 01-03 aluminum 5.7

243 LS6 aluminum 5.7

852 and 706 99 and up 4.8-5.3 truck heads

873 99-00 LQ4 6.0 iron heads

317 01 and up LQ4 6.0 aluminum heads

035 02 and up LQ9 6.0 aluminum heads

Even more info:

Casting Number 806 or 933

LS1 (Perimeter Bolt)

97-98 5.7L Passenger Car and Corvette

Material: Aluminum

Combustion Chamber Volume: 66.67cc

Intake Port Volume: 200cc

Exhaust Port Volume: 70cc

Intake Valve Diameter: 2.00 inches

Exhaust Valve Diameter: 1.55 inches

Casting Number 853 or 241

LS1 (Center Bolt)

99-00 5.7L Passenger Car and Corvette (853)

01+ 5.7L Passenger Car and Corvette (241)

Material: Aluminum

Combustion Chamber Volume: 66.67cc

Intake Port Volume: 200cc

Exhaust Port Volume: 70cc

Intake Valve Diameter: 2.00 inches

Exhaust Valve Diameter: 1.55 inches

Casting Number 243

LS6

01+ 5.7L Corvette

Material: Aluminum

Combustion Chamber Volume: 64.45cc

Intake Port Volume: 210cc

Exhaust Port Volume: 75cc

Intake Valve Diameter: 2.00 inches

Exhaust Valve Diameter: 1.55 inches

Casting Number 706

LM4 / LM7

99+ 5.3L Truck

Material: Aluminum

Combustion Chamber Volume: 61.15cc

Intake Port Volume: 200cc

Exhaust Port Volume: 70cc

Intake Valve Diameter: 1.89 inches

Exhaust Valve Diameter: 1.55 inches

Casting Number 852

LR4

99+ 4.8L Truck

Material: Aluminum

Combustion Chamber Volume: 61.15cc

Intake Port Volume: 200cc

Exhaust Port Volume: 70cc

Intake Valve Diameter: 1.89 inches

Exhaust Valve Diameter: 1.55 inches

Casting Number 317 or 035

LQ9

01+ 6.0L Truck

Material: Aluminum

Combustion Chamber Volume: 71.06cc

Intake Port Volume: 210cc

Exhaust Port Volume: 75cc

Intake Valve Diameter: 2.00 inches

Exhaust Valve Diameter: 1.55 inches