New Cloyes timing set. This is a performance timing set.  This is a "Race Billet True Roller" series timing set.  It has a 9-position crank keyway for 0, +2, +4, +6, +8, -2, -4, -6 and -8 crank timing adjustments and is a double roller timing chain. Includes crank gear (billet), cam gear (billet) and timing chain (.250" double roller). Fits the following:

77-79 Firebird/Trans Am with 403 Oldsmobile Engine