I got a set of the Speed Pro in one of my 440's, ran it with stock rods and didn't balance it. It was with a forged crank, not sure if that makes a difference. Didn't seem to hurt anything and ran okay (shifted at 6000, didn't turn over 6200)

I was researching the Weisco pistons awhile back and didn't have any luck finding weights on them, but did email Hughes about P/N:PTS531A3 and they said they weight Piston 546.50, Pin 220.39.