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Recently purchased an 2001 WS6. I was replacing the rear main seal and noticed I was not informed on the aftermarket Cam that is installed. Anyone have any idea on how to identify the Cam using the image below? Tried scanning what appears to be a QR code but no luck. Mystery Cam
This is what a search produced:
The camshaft marked 1721 is the GM part number 12561721, a stock hydraulic roller camshaft used in 2001–2004 LS1 engines (Camaro/Firebird) and 2001–2004 LQ4/LQ9 6.0L truck engines.
Specifications
Duration @ .050": 196° Intake / 207° Exhaust
Lift @ .050": 0.467" Intake / 0.479" Exhaust
Lobe Separation Angle (LSA): 116°
Base Circle: 19.7mm
Application: 5.7L LS1 cars, 6.0L LQ4/LQ9 trucks
Now as to whether that is accurate or not, I don't know.
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Mystery Cam - 2001 WS6 
