DJ Rock HBK949 Engine Cylinder Head Bolt Set

Engine Cylinder Head Bolt Set for Toyota Applications

DJ Rock HBK949 is a premium engine cylinder head bolt set built for secure cylinder head retention under high heat and repeated thermal cycling. It is engineered for Toyota, Scion, and Prius applications where consistent clamping force and accurate torque are critical to head gasket sealing and engine reliability.

Key Features

• Premium-grade cylinder head bolt set for engine top-end service
• Heat-treated carbon or alloy steel construction for strength and fatigue resistance
• Designed to maintain stable clamping force under thermal and mechanical stress
• Supports proper torque application with hardened steel washers in applicable designs
• Direct replacement for select Toyota Prius, Yaris, Echo, Scion xA, and Scion xB applications
• Part number HBK949 for cataloging and cross-reference use

Detailed Description

DJ Rock HBK949 is a premium engine cylinder head bolt set for select Toyota Prius, Toyota Yaris, Toyota Echo, Scion xA, and Scion xB models. Built from durable heat-treated steel, this set is made to deliver the clamping consistency needed when servicing the cylinder head and head gasket area. The design supports accurate torque loading and long-term sealing integrity in engines exposed to repeated heat cycles and pressure changes. This part number, HBK949, is a practical choice for engine rebuilds and head gasket repairs where OE-style fastening performance matters.

This part cross-references ES72197 and MAHLE GS33476 for the same application.

Vehicle Fitment

• Fits 2016-2019 Toyota Prius C, N/A
• Fits 2016-2018 Toyota Yaris, N/A
• Fits 2012-2015 Toyota Prius C, N/A
• Fits 2007-2015 Toyota Yaris, N/A
• Fits 2001-2009 Toyota Prius, N/A
• Fits 2004-2006 Scion xA, N/A
• Fits 2004-2006 Scion xB, N/A
• Fits 2000-2005 Toyota Echo, N/A

Common Repair Uses

• Replacing stretched or torque-to-yield head bolts during cylinder head service
• Restoring head gasket sealing after overheating or coolant loss
• Addressing combustion leakage caused by reduced clamping force
• Supporting engine rebuilds on Toyota Prius, Toyota Yaris, and Toyota Echo platforms
• Correcting fastener wear found during top-end teardown

Installation Notes

Follow the factory torque sequence and torque specifications for the specific engine. Torque-to-yield head bolts should not be reused after removal. Inspect the cylinder head, block deck, and gasket surfaces before assembly, and verify that all fastener threads are clean and properly prepared before final tightening.

Quality Assurance

DJ Rock HBK949 is manufactured to meet or exceed OEM quality standards using durable, heat-treated steel for dependable fastening performance in engine service.