JUN Auto Adjustable Cam Sprocket – Nissan/Datsun L20 / L24 / L26 / L28. #1006M-N001. Datsun, 240Z, S30, S31, S32, and Datsun 510. Made by JUN Auto, Japan’s Top Tuner/Manufacturer! Dial in your cam timing for maximum horsepower! JUN Cam Gears are designed purely for performance, with the zero mark set exactly at TDC for precise and accurate adjustment. These cam gears conform to OEM cam gear outer rings for perfect timing belt fitment. SOHC Cam Sprocket.