for a change I didn’t have to deal will snowblowing my yard so I hit the shop and started on my sons Speedmaster heads then intake. I’m going to try to break down each post with pictures and maybe a little more detail to each area of the head so it will be easier if you want info on that area. First thing I did today was take both heads to my drill press to prepare them for tubing. I run a 9/16 drill bit through the two head bolts that run between all four intake valve. One on each head oils you rocker gear so these oiling holes will need redrilled at a later date. After I open up those two holes I run a 17/32 drill bit through the four pushrod holes that create the dreaded “pinch”. I then blow and semi clean the head for bench work. I cut four 9/16 part number K&S 141 (3.5 inches long) for both heads and eight 17/32 part number K&S #140 (2.750 Long) enough for both heads.
