For starters, big thanks to all the members of this forum! Your posts have helped me with many issues with my trucks. Now I have a new problem... Long story super short, 97 f150 4.6 Romeo, lots of valve train noise, showing low pressure after going down the road a while. I've used a mechanical gauge and verified everything, tried different oil weights and most importantly, yes, I've read all the related threads I could find and it looks like others have had the same problem and it was a clogged oil restrictor. My questions are where is the oil restrictor on the motor and where do I buy replacements? Or is this a piece that's out of production that I'll have to manufacture myself? Thanks in advance for any and all help.