The stock tappet is .990", no room for a bushing, no idea how much wall thickness there is to install one. What would be your guess at minimum bushing wall thickness?
The tappet bore is slotted for the key? How deep?
The rocker dims are limited by needing to be both directly over the stem tips and the pushrod reliefs (the fulcrum/shaft/trunion falls wherever). I asked Jesel a while back for rockers at 1.7 or 1.8:1 with point-to-point of about 3.40" (levers: 2.19" and 1.21", etc.), no reply. The Howard may have larger pushrod relief holes, so the length is only approx.
I wrote an .xls to calculate rocker ratios from distance from pushrod to stem tip, PM for a free copy.
The intake looks like a rectangle (w/rounded corners) 1.69" tall by 1.88" long, approx. area (slightly less than) a 2.00" injector throttle.
