C6Performance Journal

ALL Gen III heads are interchangable.

Here is a list of a few casting #’s:

933 97 aluminum perimeter bolt 5.7
806 97-98 aluminum perimeter bolt 5.7
853 99-00 aluminum center bolt 5.7
241 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 castings)
243 LS6 aluminum center bolt 5.7
862 and 706 99 and up 4.8-5.3 truck heads
873 99-00 LQ4 6.0 iron center bolt heads
317 01 and up LQ4 6.0 aluminum center bolt heads
035 02 and up LQ9 6.0 aluminum center bolt heads

Even more info:

Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12559806 (1997-98) Chambers = 69cc
12559853 (1999-00)
12564241 (2001-03)
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 243
Head: 2001 LS6 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12564243
Combustion Chamber Volume: 64.45cc
Compression Ratio: 10.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 373
Head: 1999-2000 LQ4 6.0 Litre Truck
Material: Cast Iron
Part Number:
12561873
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 317
Head: 2001+ LQ4 6.0 Litre Truck
Material: Aluminimum
Part Number:
12572035
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

* It takes about .005″ milling of the block deck to remove 1cc of volume. It takes .007″ milling to remove 1cc from an LS1 head

Simple Milling Math:

You have a stock 66cc chamber and you want to get down to 63cc

66-63 = 3. You have to remove 3cc’s

.007 x 3 = .021. So to get your 66cc chambers down to 63cc you’d have to mill ~.021.

You can also do the reverse, say you want to mille a head .030 to figure out how many CC’s that removes you take .030 / .007 = ~ 4.28. Milling a stock 5.7 head .030 puts your chamber at ~ 62.

* 241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. Once ported any “advantage” the 241 cast had is moot.

The 4.8/293, 5.3/325, 5.7/346, and 6.0/364 can be found in…

Cars
1997 – 2004 Chevrolet Corvette (5.7)
1998 – 2002 Chevrolet Camaro (5.7)
1998 – 2002 Pontiac Firebird (5.7)
2004 – 2005 Cadillac CTS-V (5.7)
2004 Pontiac GTO (5.7)

Trucks, Vans, SUVs
1999 – 2004 Chevrolet Silverado (4.8, 5.3, 6.0)
2000 – 2004 Chevrolet Tahoe (4.8, 5.3)
2000 – 2004 Chevrolet Suburban (5.3, 6.0)
2002 – 2004 Chevrolet Avalanche (5.3)
2003 – 2004 Chevrolet Express (5.3, 6.0)
2003 – 2004 Chevrolet SSR (5.3)
2003 – 2004 Chevrolet Trailblazer (5.3)
1999 – 2004 GMC Sierra (4.8, 5.3, 6.0)
2000 – 2004 GMC Yukon (4.8, 5.3, 6.0)
2003 – 2004 GMC Envoy (5.3)
2003 – 2004 GMC Savana (5.3, 6.0)
2001 – 2004 Cadillac Escalade (6.0)
2002 – 2004 Hummer H2 (6.0)
2003 – 2004 Isuzu Ascender (5.3)
2004 Buick Rainier (5.3)

Models LS1 Offered In
1997 – 2004 Chevrolet Corvette
1998 – 2002 Chevrolet Camaro (Z28 and SS)
1998 – 2002 Pontiac Firebird (Formula and Trans Am)
2004 Pontiac GTO

LS1 Specifications
1997 – 2000 Chevrolet Corvette
345hp @ 5600rpm
350tq @ 4400rpm
2001 Chevrolet Corvette
350hp @ 5200rpm
375tq @ 4400rpm (360tq @ 4000rpm w/Automatic)
2002 – 2004 Chevrolet Corvette
350hp @ 5200rpm
375tq @ 4000rpm (360tq @ 4000rpm w/Automatic)
1998 – 2000 Chevrolet Camaro Z28
305hp @ 5200rpm
335tq @ 4400rpm
1998 – 2000 Chevrolet Camaro SS*
320hp @ 5200rpm
345tq @ 4400rpm
2001 – 2002 Chevrolet Camaro Z28
310hp @ 5200rpm
340tq @ 4000rpm
2001 – 2002 Chevrolet Camaro SS*
325hp @ 5200rpm
350tq @ 4000rpm
1998 – 2000 Pontiac Firebird Formula/Trans Am*
305hp @ 5200rpm (320hp @ 5200rpm w/WS6)
335tq @ 4400rpm (345tq @ 4400rpm w/WS6)
2001 – 2002 Pontiac Firebird Formula/Trans Am*
310hp @ 5200rpm (325hp @ 5200rpm w/WS6)
340tq @ 4000rpm (350tq @ 4000rpm w/WS6)
2004 Pontiac GTO
350hp @ 5200rpm
365tq @ 4000rpm

Models LS6 Offered In
2001 – 2004 Chevrolet Corvette Z06
2004 – 2005 Cadillac CTS-V

LS6 Specifications
2001 Chevrolet Corvette Z06
385hp @ 6000 rpm
385tq @ 4800 rpm
2002 – 2004 Chevrolet Corvette Z06
405hp @ 6000 rpm
400tq @ 4800 rpm
2004 – 2005 Cadillac CTS-V
400hp @ 6000rpm
395tq @ 4800rpm

* Does NOT include Firehawk or optional SS content from SLP.

The Gen III Small Block V8
RPO, Cubes, Bore x Stroke, and Liters

LR4, 293 cu/in, 3.779” x 3.268”, 4.8 Liters
LM4/LM7/L59, 325 cu/in, 3.779” x 3.622”, 5.3 Liters
LS1/LS6, 346 cu/in, 3.898” x 3.622”, 5.7 Liters
LQ4/LQ9, 364 cu/in, 4.000” x 3.622”, 6.0 Liters

Gen VII Big Block (thrown in for good measure)

L18, 496 cu/in, 4.250” x 4.37”, 8.1 Liters

The 5.3 is NOT a 327.
The 5.7 is NOT a 350.
The 8.1 is NOT a 502.

– Steve (DMNSPD)

I have compiled a list of all the locations, colors, and wires for shift lights for the 96-97 LT1 f-body, all LS1, all LS2, all LS6, and LS7 engines in the GTO, F-Body, and Corvette. Hopefully this will help those when wiring in the shift light. All of the connector #’s, pin #’s and wire colors are at the PCM. All of this info was copied from the engine controls schematics from GM’s service website.

IGN = Ignition voltage for your power wire
ESS = Engine Speed Sensor Signal for your shift light signal wire.

96-97 F-Body LT1
IGN – Connector #2, Pin 30 – Pink Wire
ESS – Connector #1, Pin 13 – White Wire

98 F-Body LS1
IGN – Connector #2 (Blue), Pin 19 – Pink Wire
ESS – Connector #2 (Blue), Pin 35 – White Wire

99-02 F-Body LS1
IGN – Connector #1 (Blue), Pin 19 – Pink Wire
ESS – Connector #2 (Red), Pin 10 – White Wire

97-98 Corvette LS1
IGN – Connector #2 (Blue), Pin 19 – Pink Wire
ESS – Connector #2 (Blue), Pin 35 – White Wire

99-02 Corvette LS1
IGN – Connector #1 (Blue), Pin 19 – Pink Wire
ESS – Connector #2 (Red), Pin 10 – White Wire

03-04 Corvette LS1/LS6
IGN – Connector #1 (Blue), Pin 19 – Pink Wire
ESS – Connector #2 (Green), Pin 10 – White Wire

05 Corvette LS2
IGN – Connector #1 (Blue), Pin 19 – Pink Wire
ESS – Connector #1 (Blue), Pin 48 – White Wire

06 Corvette LS7
IGN – Connector #1 (Black), Pin 47 – Pink Wire
ESS – Connector #1 (Black), Pin 48 – White Wire

04 GTO LS1
IGN – Connector #1 (Blue), Pin 19 – Orange Wire
ESS – Connector #2 (Green), Pin 10 – Brown w/Red Tracer

05-06 GTO LS2
IGN – Connector #1 (Blue), Pin 14 – Pink Wire