Mike--couple thingies---

Didn't some of those 351 engines use rockers that centered/guided on the valve tips???

Also--looks like some valves have longer tips than others(sorta like those for the tip centered rockers)

And, it appears that it is those valves that are the farthest off center???

Anyway---I think the valve spring/retainers are about to(or do) touch the rockers on some of the valves and the others are way up in the air---