Billet Aluminium Valve Cover – BMW M57 (M57N & M57N2)

Designed & Manufactured in Perth by ASLmods

Introducing the ASLmods Billet Aluminium Valve Cover, engineered from a solid block of 6061-T6 aluminium to replace the weak, failure-prone factory plastic valve cover found on BMW M57 engines. Designed, machined, and tested in Perth, this cover provides superior sealing, strength, and functionality—especially for high-boost and conversion builds.

Unlike OEM covers, our design ensures consistent sealing where the intake manifold runners pass through the valve cover, preventing the common boost leaks seen on tuned M57 engines.

Key Features

• Billet 6061-T6 aluminium construction
  Zero flex, zero warping, zero cracking—built for abuse.

• Lower profile design
  Sits lower than the factory cover, giving extra clearance for top-mount turbo setups and custom manifolds.

• Dual -12AN breather ports
  Two high-flow -12AN ORB fittings for a proper PCV/engine breather system suited to high-power and high-boost builds.

• Front-mounted PCV system
  PCV / breather outlets relocated to the front of the cover for cleaner, easier plumbing—ideal for swap vehicles and custom turbo setups.

• Front-mounted oil fill location
  Oil fill cap moved to the front for better service access in tight engine bays.

• Improved intake runner sealing
  Perfect for tuned engines where OEM covers often leak under boost.

• Direct bolt-on
  Uses OEM gasket, sensors, and mounting hardware.

• Precision CNC machined with ASLmods branding.

• Designed, tested, and manufactured in Perth, Western Australia.

Engine Compatibility

Fits all BMW M57N and M57N2 engines:

• M57N: 306D2, 306D4

• M57N2: 306D3, 306D5

Direct fit for OEM M57 platforms and popular conversion builds (Patrol, Land Rover, Toyota, custom projects).

Ideal For

• High-power M57 builds

• Top-mount turbo setups

• Engine conversions with tight engine bays

• Eliminating OEM valve cover cracking and boost leaks

• Clean AN-line PCV plumbing