Thanks for the replys so far. The engine is a 1957. It does not have an oil filter fitted. Today I tried an aftermarket gauge and on start up it registered about 42 pounds at about 1500 revs. According to the book I have normal oil pressure is around 35 pounds. I guess when hot.Is it possible the oil pickup is installed incorrectly or could the oil pump be faulty. It was a new one but I never checked it.It only seems to lose pressure when the oil is hot and only when I pull up fairly quickly.
