The Alliant Power AP0047 is a new grade A 0.95mm left (driver-side) head gasket for 2001–2016 GM Duramax applications. Alliant’s Engine Cylinder Head Gasket seals the cylinder head to the engine block to help contain combustion pressure, coolant, and oil passages.

Features & Benefits

• New Alliant Power Grade A 0.95mm left (driver-side) head gasket (Alliant P/N AP0047)
• Fitment Position: Driver or Left Side
• Thickness: 0.95mm
• Bore Diameter: 105.4mm
• Design: Multilayer Steel with FKM bead
• Direct replacement for 12637787 / 19301792 / 97188467
• Backed by Alliant Power’s 24-month, unlimited-mileage warranty

Application

• Chevrolet Silverado 3500 (2001–2006)
• Chevrolet Silverado 2500 HD (2001–2016)
• GMC Sierra 3500 (2001–2006)
• GMC Sierra 2500 HD (2001–2016)
• Chevrolet Silverado 3500 Classic / Silverado 2500 HD Classic (2007)
• Chevrolet Silverado 3500 HD (2007–2016)
• GMC Sierra 3500 Classic / Sierra 2500 HD Classic (2007)
• GMC Sierra 3500 HD (2007–2016)
• Alliant Power lists additional vehicle applications for this part number

Always verify fitment against your VIN, engine, and OE part number before ordering.

Cross-Reference / Replaces

• General Motors: 12637787, 19301792, 97188467, 97288226, 97309562, 97333725, 97378102, 97389256, 98030631, 98045058
• Alliant Power: AP0047

Warranty: Alliant Power’s standard warranty: 24 months with unlimited miles/hours on installed parts (Alliant Power warranty policy, rev. Aug 2025).