71 Dart 410 stroker ..

So have you figured out why the valve dropped? Them picture look way to familiar to me. Only i drop a intake valve that cracked the cyl wall and then broke the head of the valve off, and shoved it threw the seat sideways. That was the first head that i attempted to port because of the big difference between the hardened intake seat/ bowl(to save the head) and all the rest. Any ways my dropped valve was because i installed shims under the valve springs and the back intake i couldn't give it a good smack, to set the lock. top of first gear, she let good and made a mess similar to your.