I've removed #1 and #3 pistons, pix at www.yourbuyersinn.com/Cars/Corvair/1967MonzaCylinderWallPix.htm I forgot to notice which way was up and down on the caps, although I can find "up and down" for the pistons with my photos. Is this importamt ? I think so, but I forgot to make a note when I finally got the caps off ! Thanks Charlie