Okay here goes. My 1976 500 in my corvair has started acting strange in regards to oil pressure. When cold has 55 to 60 psi at 1500 and 45 at idle of 700.When it warms up it starts droping.When warmed up at 180 to 190 temp the pressure drop to 18 or 20 at idle and 25 or so at 1500 to 2000 rpm.it might go to 30 to 35 if it revs up to 3000 rpm. Is there something i can look at besides a rebuild. The pump is stock .Would the spring in the pump be getting weak? Richard richie49 PS I was following the tread on dissappearing oil pressure,but there no follow up on it.