I thought I'd bring this to the top. I do notice the ac/delco 2232 has a pressure relief valve set at 8-16 #'s. Puralator has filter #35399 also. My Chevy, bored and stroked (396 c.i.),LT1 block has the by-pass valve set up to never open and all the oil goes thru the filter. I have a high...