After reading these postings I got thinking that it seems mopars are the only ones I have seen these real deep pans . I know back in the sixties there were some on chevy's but now that the cars are lower most run a dragster type pan or kick out type. Being that chevy cranks hang out of the bottom of the block to start with 3-4" , the 6" theory would mean that the oil level would start at 9-10" from the pan rail , then add on the rest of the pan for capacity. I know in a perfect world it would be better but most of us don't.