This is a new one piece  427 Sohc timing sprocket that uses a .250 bottom chain and stock top cam chain. This is what ford should of done!  Uses only .001 press for on stub cam and stub cam shaft must be machined down on back step same as the front sprocket. Both sets of teeth have been cut with a original hobb cutters, This has being tested on my own 427 Sohc engine which was worked flawless! Can install on comp cams stub shaft like the one in picture. No more worries of sprockets chewing out the keyway like on the old two sprocket system, and cam timing going out of time. This sprocket is the same weight as the two piece sprockets, this is a engineered product! The one in the first three pictures is the one I'm running, the last picture is the one that you will receive,I have numerous of these out there being used! Feel free to call me anytime. This is a patent pending product! 1-403-700-0287.  Will ship to everywhere in the world.