Hydraulic lifters? May have over revved and pumped up a lifter, putting a piston into an exhaust valve, bending the valve and pushrod... bent pushrod then fell out...

 

Sorry, should have stated Solid Roller.
I was concerned with the wear pattern so close to outside of the valve stem

 

loss of valve train control means the springs are too weak, perhaps one spring is failing.

 

also possible that a exhaust valve is sticking in the guide

 

What kind of RPM’s do you visit. The combination of a bent valve stem and popped out rocker speaks to a collision between piston and valve.

A push rod coming out of the rocker for fitment reasons would simply let the valve snap seated, there would be no moment involved that would bend the stem.

This could also result from the valve sticking. Exhausts run mighty hot which eats the clearance space, cooks what little lube they get into a sticky gum, so this adds a possibility that even with revs not high enough to where the valve spring lost control the valve could be sticking open and got hit.

I greatly recommend pulling the head for both investigation of contact with the piston but, also, to correct any damage done to the guide.

Bogie

 

Pushrod length or the location of the contact pattern ae not the cause, you're going to have to dig deeper.
Piston hitting valve by way of bad spring or tight guide have been mentioned already, two prime places to look.
Third would be just not enough spring for the combination, and this is just the unlucky first one to be hit.

You said Jesel Rockers, I'm assuming shaft??

 

Yes. 1.7 sportsman rockers. One bent exhaust valve. Cylinder #1. Im leaning to exhaust valve stuck. Got head off, one damaged valve. Will pull other head tonihgt and take a look. Learning towards leaving exhust valve seals out this time, will correct stem to guide clearance issues. Yes we rub theses small blocks pretty hard 6200 rpm or so more

 

6200 even sustained aint nuttin

Sent from my SM-G960U using Tapatalk

 

6200 at WOT as seen in boats sometimes can be brutal---the Dyno pull that never ends

 

Those cranks are always loaded. What about 6400 in a dirt track car where the cranks get's loaded one way and them suddenly loaded the other way!

Nobody likes running over their own crank regardless.

I'd run a bore scope in the cylinder and look at things. If all is well, replace the spring and PR.

 

Heads are off, easy fix at this point. Guide looks tight. I will leave the PC Seals off the exhausts. FYI, Spoke with Jesel about the witness marks on the valve stems, he says rocker support is too high pushing the rocker towards the outside, so I will double check that upon reassembly. I have the proper tools to set that up, may need a shorter base shim. Thanks for all that responded Richie