fram filters
Guys this also happen to me not to long ago, I had just got a new short block from Shafiroff a new dart block and all th e goody's put my cam and heads on it set it in fired it up and it realy sounded good let it get good and hot shut it off ,later my son came by to hear it run and when it started i noticed I only had about 20 lbs of oil pressure .shut it down and started checking things out after pulling valve covers checking the oil I pulled the filter off and found it had collasped on the inside blocking the hole .Didn't hurt the motor but I use nothing but K&N from that point on