Notice the large amount of piston skirt left after cutting the reliefs for the main transfers. This allows pistons to be re-mounted in the lathe if re-cutting for fitting is necessary. Pistons with the entire skirt relieved showed no HP increase as a result of not blocking the boost ports at BDC. A larger skirt area also helps to control piston movements in the axis opposite the wrist pin & crank pin. Also notice in this & the previous photo the relief in the connecting rods bottom end. Two staggered oil slots & the fact that the rod runs in a groove in the crankcase provide ample lubrication. One oil slot is used in the upper end & all slots are .156 long on ODs X .032 wide. ALL INSIDE CORNERS EVERY WHERE HAVE A RADIUS!!
