i have a 455 rebuilt the oil psi at port right above the oil filter is 42-45 psi at ideal up in valve cover looking in hole don't see as much as i wood think should be there no oil stream flowing small puddles that's it thinking i mite need adjustable spring for the psi reg that's in it. but 42 psi shod be plenty to get a decent flow don't you think ???? looking forward to your thots thanks ruddog