38 221 engine questions

[marko39]

i opened up a 38 engine i have had for 40 yrs. to check its condition. pistons are steel and measure about 3.036. is that a stock piston for a 3.062 bore? cyl. bore measures about 3.077. what is the wear limit before boring is needed? last, i measured valve clearances and all are .004-.005 over spec. is this normal and what would be the probable cause? all other engines i had had tight clearances and valve stems had to be ground. thanks, Mark