Kaw rider,
If I work out the size shape and location, would you be able to do a windowed piston for the early barreled motors? I dont think the above piston would work too well as the early type has a bridge in the middle of the inlet port which extends down the middle and stops short of meeting the barrel at the bottom of the port.Not only would this possibly cause problems due to hangin up on the 'nub', but it would obstruct gas flow thru the window, reducing effectiveness. Was thinking 2 vertical rectangle shapes either side of the bridge nub. Your thoughts appreciated.K.