That's what I was going to do if I couldn't get a clear answer on the oem length. Wasn't there a change around 1984 when they changed everything and the oil capacity changed to 5 quarts? I read that somewhere and I don't have a book to tell me what "full" actually is. I feel stupid asking that question but google doesn't like that question as much as real people on forums do... Is it still 5 quarts for the pre 1984 engines? I just want to make sure I have the correct amount before making a new mark on the dip stick I have now.