318 Connecting Rods and Crankshaft

I just meant that stock chambers are always larger than the number found in the service manual or the NHRA minimum spec- which is usually the same thing
as you just found out
so you can do your calcs and eliminate the "about"
9.5 is good unless you are a motorhome
sorry about your loss
just get rid of any sharp spots then if not unshrouding
however unshrouding with a SERDI or other valve cutter is sorta a freebee