Precision-engineered from heat-treated steel, KPMI base washers reliably control lateral spring movement and ensure the correct valve spring installed height across intake and exhaust applications. Each washer features an inside diameter matched closely to the valve guide with proper clearance for oversized guides, while specifically radiused corners prevent sharp edges.

Developed using advanced FEA design software, these OEM replacement base washers offer maximized mechanical strength and dependable performance under demanding valvetrain conditions. Their shoulder diameters are meticulously sized to ensure an exact fit with your valve springs.

Key Features

Highlights

• Engineered with FEA design software for maximum mechanical strength
• Manufactured from durable heat-treated steel
• Controls lateral valve spring movement and sets proper installed height
• Radiused corners prevent sharp edges
• Pack of 4 OEM replacement washers

Compatibility

Fits 1936–1947 Harley-Davidson Knucklehead models (Intake and Exhaust).