I’ve tapped broken headbolts on a tec before and it worked flawless. I’m sure it would be almost no different then tapping new holes all together. As long as the head torques to the briggs 80-100 inch pounds that seems like the easy part. Pushrods can be had pretty easily.
The rockers/tappets would be the hardest part as I’d have to drill the tappets for the pushrod to set into. And coil bind how much lift ect. Again heads are $26 and whole head kits are $38 I’m definitely gonna try it myself one day. An OHV conversion would make my cam swaps super easy. Not working in the valve chamber with the springs as there above the head now.
View attachment 316958
View attachment 316959