Billet Aluminum Timing PointerBig Block Chevy 454AdjustablePolished FinishBalancer Diameter: 8" Get up to four degrees of timing adjustment with Procomp Electronics adjustable timing pointers. They're precision-machined from T6-106 billet aluminum, and are designed for a minimum of clearance between the pointer and damper, so parallax errors reading the timing marks are virtually eliminated. Mounting hardware is included.