I was having the same problem even though I changed the oil pickup, cleaned the oil pan, rebuilt the oil pump and flushed the motor with kreen, but it still loses oil pressure after about 10-15mins of running. Maybe this oil filter would help me as well, where could I buy one of these oil filters?
I read on this other thread that it could be the oil pressure valve sticking, could someone tell me where it is located? Thanks.
1970 Dodge Charger R/T SE 440/727 (Work in progress)
1968 Plymouth Sport Satellite 383/727 (Work in progress)
1970 Plymouth Valiant Duster 318/904
1972 Buick Skylark 350/350