Bent valve in number 5. Only a very small one but enough to hold open about .25/ .5mm. Straight edge over the valve train confirmed it was a little low. Rest of the motor is fine, no big marks on the piston, Engine builder is gonna check it all out to be safe. Just got to order parts once he works out what we need, BBM heads still look fine!!!.
 

So a while back I broke a roller rocker on my 428. Mild build in my 69 mustang. Had to drive it home. upon pulling the covers I discovered the broken rocker and bent pushrods. Put a new set of pushrods in and put the original rocker shafts back on. Took it for a drive and felt fine. went for a longer drive the other day and it has developed a miss. Pulled the plugs and sure enough 2 fouled. Same cylinders as the bent rods. Put new plugs in and no diff. checked plug leads and cap, got spark at the plug. Still misses on that cylinder. No funny noises!! Is it possible it may have bent a valve? or something more serious? will put a bore scope in tomorrow? maybe a crook cap? They are BBM heads, 40tho over cam etc. Was reving it when the rocker broke.