Recently, I changed my 305 to a Goodwrench "Universal" 350. The oil pressure at idle after warm-up is 45 lbs. and at highway cruising is 60 +lbs. Some other particulars are 10-40 oil, Pure One filter and I replaced the oil filter by-pass with a Perma-cool conversion adapter. I'm starting to get some minor oil leaks that I attributed to high oil pressure. Am I correct? Is the 60+ too high? The old 305 used to idle at about 13 lbs. Could the oil filter bypass relief thingy give me high oil pressure? I'm thinking not cause it only eliminates by-passing the oil filter. Could the oil filter be too restrictive and cause high oil pressure? Does the guage read "pre" or "post" of the filter? Is the 40 weight oil too thick? Any small-block gurus out there? Ron '84 K5......Tree Fitty, SM465/Np205, D44/14BFF, Pro-jection! .....and of coarse no other color than Odie!