Today I preoiled with another m72 pump/std 3/8 pickup & got NO flow up top with the new lifters. put in a prior set of slightly used ones & it gushed up top (like before). I tried another set of slightly used lifters & NO flow up top. All (3) sets appear externally to be the same (not sure of the brand but I think Melling on all (3). the oil holes in the recessed band on all (3) sets is .094. I'm lost! Any thoughts? EDIT .104" pushrod oiling orifice (if that is critical).