I must have lucked out with my small sector borgenson box, factory pitman arm , doughs headers and mildon road race pan. No clearance problems at all, 2 or 3 threads showing after nut and lock washer. I had enough clearance to headers that I was entertaining trying a quick ratio pitman arm. This is in a 69 Bee RB block Doughs D452 2" headers. The pain was the lakewood bellhousing with block protector.
