the spring was an intake spring..which is taller
it was compressed to much at the installed hieght,pressure was incressed cause of that
lift was reduced for the retainer and valve guide clearance and made the spring coil bind with the .485 lift
i am sure there was more to it than that but the fact was I found the wrong spring had been installed on it
but the valve guide and seal was chewed up,tip broke off valve,piston shatterd,cyl bore gouged up by piston pin..ect..
dont think a piston hitting a valve will snap the end off of it and leave the locks on the tip in the retainer
the valve that was broke was in the oil pan bent to a 90*
machine shop was good for it and agreed that it was the taller spring snaped the valve tip off then the valve then fell down the hole after the piston shatterd