S&S Cycle 640 Series Grind Cam for 2006-2016 Harley-Davidson Big Twins

S&S Cycle 640 Series Grind Cam for 2006-2016 Harley-Davidson Big Twins

The S&S 640 Series Grind Cam is designed for Big Twin engines pushed well beyond stock displacement, delivering an aggressive power curve that stays strong from mid-range through the top of the RPM band. Riders who have built a serious motor will feel the 640’s output advantage immediately – a cam that matches the commitment of a fully built engine.

Key Features

• High-lift cam profile designed for modified Big Twin engines
• Strongest from 3000-6000 rpm
• Requires high-lift valve springs and adjustable pushrods
• Compatible with hydraulic or solid lifters
• Made in the USA

Technical Specifications

• Compatible Displacement: 95, 96, 103, and 110 cubic inches
• Compression Range: 10.5:1 to 11.5:1
• Power Range: 3000-6000 rpm
• Tappet Type: Hydraulic or solid
• Spring Requirement: High-lift springs required
• Pushrod Requirement: Adjustable pushrods required

Fitment Notes

• Fits 2006 Harley-Davidson Dyna and 2007-2016 Big Twin models
• For 95ci, 96ci, 103ci, and 110ci engines
• High-lift springs and adjustable pushrods required before installing
• Verify coil bind, valve-to-valve clearance, and valve-to-piston clearance
• Review the Fitment tab for complete year and model breakdown