No, if you are running stock port cylinders, you HAVE to run a spacer plate. If you want to run stroker domes instead, you would have to have the cylinders ported to affectively "raise" the ports for the 4mm stroke, and ditch the plate. one or the other... except, I have run stock port cylinders w/a 4 mil crank, (no "plate"), and stroker domes in the past. makes a excellent woods bike, TONS of low-end, but NO top-end...and if you try to run them on top, set-up like this, the motor won't last too long.