Abstract: A camshaft variable timing unlocking device for mounting to a camshaft variable timing mechanism which has internal passages in which compressed air is introduced to unlock a spring loaded lock pin. The camshaft variable timing device is than rotated counterclockwise/retard by mechanical means to any position relative to the crankshaft centerline. Accurate piston to valve clearance of both intake and exhaust valves can be checked and verified for racing and/or other high performance applications. The camshaft variable timing mechanism can be unlocked without any damage to the internal spring loaded lock pin mechanism allowing it to be reused.