had two blocks one was a 1975 the other is a 1976 both came in with the numbers solidly in the .310-.320 range had a spot here and there that was in the mid 200 range worse being 245, and a couple around .260-.280,,95% are .300 or better.
Dude, you got really lucky Maybe it is time for you to buy a lottery ticket while your luck is in town AKA, those are stout block castings Flog the dog snot out of both of them
I said somthing to him about doing a half fill and he promptly told me to not waste my time and money and that blocks like that don't need it besides he is not a proponant of using filler because of thermal issues in the cylander.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Maybe it is time for you to buy a lottery ticket while your luck is in town 
AKA, those are stout block castings 
Flog the dog snot out of both of them 
