I just told you the valve will bend. The piston doesn't hit the head. I've repaird hundreds of engines with broken timing gear.
Shane, below is what i posted... which was what you replied "No" to.
While the crank pushes and pulls the piston up and down via the connecting rod, the cam opens and closes the valve at the appropriate time (in relation to the piston move,ent). If a cam chain fails the piston will hit the valve in an interference designed engines. Such will push the valve up into the cam, trying to lift the head off in the process. But head bolts are stron so they will resist. What usually gives is the valves bend and punch a hole in the pistons... it makes a mess of the engine in any case... In a non interference engine, the pistons and valves can never collide so one simply looses power...
But. I’m no expert.....
My posy was in part to clarify what Sabbath may have meant by piston "lifted the head off slightly" as i doubt he or any high post count JC member actually things the valve cam controls piston lift... But you seem to be caught up in semantics now...
So just to clarify, I've highlighted what i said in my post as you saying "No" clearly means you think I've said something that is incorrect.
It can't be piston hitting the head cause i never said that.
It can't be head bolts snapping cause i didn't say that either.
What is said is that head bolts are strong and the valve bends and punches a hole in the piston.
Later I also said the weakest part breaks (either the valve and/or piston)...
So it's not an issue of whether you have repaired one or a thousand engines with damaged timing gear. The issue was you wrongfully claim statements from me that are not within my post. Reality is we are probably not far apart in what we are saying so to debate whether a piston hits a valve or a valve hits a piston or indeed how much force is needed to bend a valve verses how much force is needed to elongate a TTY head bolt a tho' isn't relevant in the grand scheme of this thread.
So I'm over the semantics and wrong attribution
Just hope the OP doesn't continue to drive his car until he kills it