Certainly preferable to have a large base circle, but there still has to be clearance for the "foot" above the lobe under the tappet gallery. This is a slight disadvantage to the VW or any other mushroom - the base cannot almost disappear up into the block at full lift. I'll bet that since there's no oil pressure (unlike later stovebolt) the bottom of the gallery could be cut back to get clearance if needed?
Anyone have ideas as to how much spring pressure the cam will stand?
