DJ Rock HBK649 Engine Cylinder Head Bolt Set

Engine Cylinder Head Bolt Set for Nissan and INFINITI

DJ Rock HBK649 is a premium engine cylinder head bolt set for applications that require secure cylinder head clamping under high heat and pressure. It is built for Nissan and INFINITI engines that use a 6-point head, including several Armada, TITAN, Pathfinder, NV2500, NV3500, and INFINITI V8 and V6 models.

For engine rebuilds and head gasket service, the HBK649 helps maintain consistent torque retention and sealing integrity across thermal cycling. This part number, HBK649, is a direct-fit option for multiple Nissan and INFINITI applications.

Key Features

• Premium-grade engine cylinder head bolt set
• Heat-treated carbon or alloy steel construction
• Built for accurate torque application and stable clamping force
• Designed for engines that require a 6-point head
• Meets or exceeds OEM quality standards
• Cross-references ES71354 and MAHLE GS33509 for the same application

Detailed Description

DJ Rock HBK649 is engineered to secure the cylinder head to the engine block and maintain gasket sealing under demanding operating conditions. It is used on 2002-2017 Nissan and INFINITI applications, including 2004-2015 Nissan TITAN, 2005-2015 Nissan Armada, 2008-2012 Nissan Pathfinder, 2012-2017 Nissan NV2500 and NV3500, 2003-2010 INFINITI FX45 and M45, 2002-2006 INFINITI Q45, and 2004-2010 INFINITI QX56. The HBK649 is a practical choice when servicing the top end of these engines and replacing torque-critical fasteners during repair.

What It Helps Fix

• Loss of cylinder head clamping force after engine teardown
• Head gasket sealing issues caused by worn or stretched fasteners
• Torque inconsistency during engine rebuilds
• Fastener fatigue from heat cycling and mechanical stress
• Service needs on Nissan and INFINITI engines with 6-point head hardware

Installation Notes and Tips

Verify engine code, head style, and model-year fitment before installation. Torque-to-yield head bolts must not be reused after removal, so replace them during cylinder head service. Follow the factory torque sequence and specifications for the specific Nissan or INFINITI engine to achieve proper clamping force.

Quality Assurance

HBK649 is manufactured to meet or exceed OEM quality standards using durable, heat-treated steel for strength and fatigue resistance. It is built for reliable performance in high-pressure, high-temperature engine environments.