Timing adjustments just got easier. Manufactured by Cloyes and brought to you by Edelbrock, the Hex-A-Just timing chain set allows for a quick and easy cam timing adjustment of plus or minus six degrees by simply loosening the cam sprocket bolts and inserting a hex head wrench into the adjustable eccentric The high quality, true roller design is manufactured from induction hardened billet steel and meets Edelbrock's highest quality standards.