THIS IS AN ORIGINAL 1968-390 FORD FAIRLANE & GT MUSTANG PS, 69 390 FAIRLANE-GT, MUSTANG-GT-W/PS STD ALT. 70-71 390 FORD W/STD ALT. W/PS, 68 428 FORD PC C6 W PS 2 GROOVE 6.187, 6.815 DIA. DEPTH 2.31". NON AIR  CRANKSHAFT PULLEY.  C8AE-6312-C #24. Has been vatted bead blasted and primered.  Any questions please email and ask. Check out our store. Thanks for ebaying with us.