The 500" motor in my 69 Dart had a 700 lift roller and always tried to push every gasket out, probably needed a vacuum pump but I did run the evac hoses to the collectors and helped a lot.


The 500" motor in my street car only has a small 557 lift solid cam and was fine for a couple years with just small breathers on the valve covers but once the breathers became oil soaked they started leaking. I put some baffled breather stands on the covers and it seems to be fine now.


Running hoses from the covers to an aluminum tank seems to be the hot setup as some of these guys have already mentioned.