Crankcase Block-Off Plate

WSM Crankcase Block-Off Plate

Protect your engine and restore proper fueling. The WSM Crankcase Block-Off Plate seals the crankcase breather port with a precision fit to prevent air leaks that can cause a lean condition and potential engine damage.

• Precision CNC-machined aluminum for durability, corrosion resistance, and a perfect seal.
• Replaces deteriorated rubber seals — original gaskets and seals harden and fail over time, allowing unmetered air into the intake.
• Prevents expensive engine damage by eliminating crankcase air ingestion and preserving proper air/fuel mixture.
• Easy to install and designed to match OEM mounting points for a clean, reliable fit.

Ideal for maintenance, restorations, or performance tuning — the WSM Block-Off Plate is a simple, effective upgrade to keep your engine running safely and efficiently.