Absolute Speed Heads????
03-30-2006, 04:18 PM
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Absolute Speed Heads???? I have a set of Absolute Speed heads for my LS1. I have called the GM shop around here and they cannot tell from the casting number what kind of GM heads they were to begin with.
Can anyone tell me what GM casting number 1256 4241 is?
Here is the website: Dyno Pro Performance
Thanks.
Can anyone tell me what GM casting number 1256 4241 is? Here is the website: Dyno Pro Performance
Thanks.
03-30-2006, 09:24 PM
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Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
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
I have that information, but these heads are rumored to be 5.4L....so that would make them diff.
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
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
I have that information, but these heads are rumored to be 5.4L....so that would make them diff.
03-30-2006, 09:26 PM
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I'm thinking that the pictures on that site are diff. from the numbers on my heads, seeing how the PN's on those heads don't line up with what I was told these I have are.
