AutoCad drawings of Harley XR 750 “Cobra head” intake and exhaust ports
AutoCad drawings of the best pushrod engine cylinder filling ports of all time. “Full Auto”, “Axtell” and stock Norton ports included. More than 50 photos, drawings and overlays showing comparisons with specs and dimensions for adapting the unique features of these “Narley” ports to Norton heads. 1st, 2nd & 3rd stage performance levels. Instructions for converting 750 into 850 heads etc. Autocad 2000 or later is required to view the drawings. In CD format (more info).