S&S Tappet for Evolution Big Twin and Sportster

These hydraulic lifters are improved over the stock lifters in several ways and are suitable both as original replacements and for performance use:

• The inner bearing shell at the roller is enlarged by 3.12 mm, allowing a stronger shaft and increasing durability.
• The hydraulic plunger features a new design that supports strong valve springs and aggressive camshafts, as typically used in performance engines.
• A control mechanism regulates the oil supply to the cylinder heads, ensuring rapid pressure buildup in the hydraulic unit.
• Each lifter body and plunger is manually matched to ensure reliable operation.