Keith, you must have an aftermarket flexplate then, I have seen jobber "428" flexplates that were solid, looks like they just welded the counterweight onto a 390 style flexplate. I often wondered why Ford punched out those triangular openings in the 410-428 flexplates. You would think that would tend to make the part weaker, although I never have had any issues with stock flexplates when I ran a transbraked C6 behind the 428 in my Fairmont drag car. JJ, I have to wonder how a 1966 dated piece could be for a 428 CJ/SCJ, since those versions did not come out until years later. And the SCJ had considerably heavier connecting rods than either the standard 428, or the CJ.