RCM Alloy/Steel Vernier Adjustable Cam Gear Pulley SetRCM Subaru Adjustable Vernier Camshaft Pulleys are engineered for high performance and competition Subaru engines where precise cam timing control is critical. Designed and manufactured to meet the demands of motorsport, these pulleys allow accurate, repeatable adjustment while maintaining exceptional strength and long term reliability. Each pulley is constructed with a high strength anodised alloy outer and a stainless steel inner hub, providing