I remember speaking with a Guy at the track 4 or 5 yrs ago that said he had a problem with his 468 blowing oil pan gaskets out..but i cannot remember what the problem was..i am wanting to think he said there was something about the rings that was causing the pressure to build in the oil pan..
i can't recall exactley..but i am almost sure this was our conversation that night.
Maybe you engine Builders out there has heard of something like this before..
i don't build them i only do some advanced assembling...lol
Brian