Mahle HS4021A Engine Cylinder Head Gasket Set

Mahle HS4021A Cylinder Head Gasket Set

Mahle HS4021A is an OEM-standard engine cylinder head gasket set built for high-output GM truck, van, and SUV applications. It uses a graphite cylinder head gasket material and includes miscellaneous gaskets and seals for a complete top-end service on supported Chevrolet and GMC engines.

Key Features

• OEM-standard engine cylinder head gasket set from Mahle
• Graphite cylinder head gasket material for dependable sealing
• Composite exhaust manifold gasket material
• Paper intake manifold gasket material
• Torque-to-yield design noted for applications that require replacement fasteners
• Additional package contents include miscellaneous gaskets and seals
• Cylinder head bolts are not included

Application Details

This Mahle HS4021A gasket set is compatible with high-output engine applications across Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 2500, GMC Savana 3500, Chevrolet C/K trucks, Suburban, Tahoe, Yukon, Blazer, G30, P30, and related Hummer H1 models listed in the fitment data. It cross-references General Motors 12521444 for the same application. For buyers searching for a Chevrolet Express 3500 head gasket set, GMC Savana 2500 cylinder head gasket kit, or Mahle HS4021A for GM high-output engines, this part matches the listed engine families and model years.

What It Helps Repair

• Coolant or combustion leakage at the cylinder head sealing surface
• Loss of compression from a failed head gasket
• Oil seepage between the head and engine block
• Intake or exhaust manifold sealing issues during top-end service
• Leak-related drivability problems on high-output Chevrolet and GMC engines

Installation Notes

Review the vehicle-specific notes before installation. Exhaust pipe gasket is not included, cylinder head bolts are not included, positive type valve stem seals are not included, and cylinder head bolt replacement is recommended where torque-to-yield fasteners are used. Confirm engine code and all gasket surfaces before assembly. This part is listed for 1992-2004 Chevrolet, GMC, and Hummer applications, including 1996-2002 Chevrolet Express 2500 and 3500, 1994-1999 Chevrolet Tahoe, and 2002-2004 Hummer H1 with high output engine configurations.

Quality Assurance

Mahle supplies sealing products used by OEMs and technicians worldwide, and this set is built to OEM-standard specifications for the listed applications. Part number HS4021A is engineered for direct replacement use on the confirmed fitments.