The HKS 23009-AN008 Gasket Stopper Kit is a high-performance head gasket upgrade engineered for the Nissan RB26DETT engine. Designed with advanced sealing technology and built to withstand extreme boost and power levels, this kit is essential for serious engine builds targeting 600PS+.

This Stopper Type head gasket features an 87.5mm bore and 1.2mm thickness, with a compression ratio of 8.7. It incorporates advanced bead design around water and head bolt holes to prevent cracking and reduce the risk of combustion gas leakage or overheating. The stopper and bead areas have also been newly designed to further improve sealing performance.

Tested under extreme conditions — including bench testing beyond 660PS and on-car performance at 600PS and 80kgm torque — this kit is track-proven for high-output applications.

• Bore: 87.5mm
• Compression Ratio: e=8.7
• Thickness: 1.2mm

Kit Includes:

• Metal Head Gasket
• Exhaust Manifold Metal Gaskets
• Intake Manifold Metal Gaskets
• Throttle Metal Gaskets

Key Features:

• Independent bead design around water and head bolt holes reduces risk of overheating and gas leakage
• New bead shape prevents cracking around head bolt holes
• Redesigned stopper and bead portions improve sealing reliability
• Engine bench tested at over 660PS; real-world tested at 600PS and 80kgm torque for circuit use

Product Notes:
HKS recommends using a reinforced head bolt kit in conjunction with this gasket for optimal performance and durability.

Compatibility Notes:
Only compatible with engines running 86mm or 87mm pistons.