Oil pressure dropping below 20 psi when braking hard on sbc 421 18 degree .warning light coming on .. Goes almost to zero but comes up when raise rpms. Jeff johnston custom 10 qt pan . tried adding extra qt. of oil . My thinking is I have a drain back issue pump is draining pan .It doesn't have oil drains in right head to oil pan. Was thinking of installing one. Does this pump have adjustment for idle or just max psi? Which is aprox 60... using Schaefer 20-50. Was told by builder that this is common, but I don't like it... Never have problems with melling pumps from past motors.. Think drain backs fix it or go back to melling and canton/ champ pans
Bookmarks