A professional-grade head gasket based on the proven OEM design of the BMW M50B25 engine (both VANOS and non-VANOS). Built for high-boost turbocharged setups where conventional multi-layer steel gaskets often fail to seal coolant and oil passages reliably under extreme operating conditions.

Technical Specifications:

Construction type: graphite-based O.M.O.O.M. (One Metal Over One Metal) with an internal metal core

Compressed thickness: 1.75 mm

Fire rings (pyramids): made of high-hardened steel, equipped with two precision-formed teeth that mechanically anchor into the cylinder head surface through localized pressure and penetration – known as mechanical bite in the cylinder head.

These twin teeth are designed to perfectly seal the combustion chambers behind the valves, where pressure and thermal stress are highest, creating an extremely robust anti-blowout barrier.

One universal fire ring fits all common bore sizes – from 84.00 mm to 86.00 mm

Recommended maximum bore: 85.5 mm for optimal sealing margin

Integrated silicone sealing zones around coolant and oil ports ensure leak-free operation without the need for any additional sealing compounds

Common Issues Eliminated by This Gasket:

Oil pressure ports (intake side) – often responsible for external leaks with other designs; this gasket seals them perfectly during installation

Oil drain passages (exhaust/coolant side) – typically vulnerable to gravity-fed leaks; our silicone-enhanced graphite structure solves this permanently

No need for RTVs, pastes, or chemical sealants – reliable sealing is achieved through the gasket’s engineering alone

Installation Recommendations:

Use head studs rated ARP 2000 or higher (e.g., L19, CA625+)

Mandatory head retorque after several full heat cycles

Compatible with OEM, sleeved, and open-deck block configurations

Designed for engines producing 800+ HP and 2.0+ bar of boost pressure, without blow-by, leaks, or dependency on additional sealing methods. Developed by professionals, tested on both street and track.

When you need sealing like a weld but flexibility like OEM – you choose K64.

Built from experience, not from a catalog.