[Prowbar]

Good luck. The shafts on my 305E were full of sludge as well, but not to the point that they blocked off the oil supply.

I am of the opinion that these engines supply to little oil to the heads. Therefore I milled out the slots in the camshaft for the 478. The camshaft controls the oiling using a slot/pocket which is cut into the bearing. The slot aligns the oiling hole in the camshaft bearing and the cylinder head, providing time for a "shot" of oil alternating between the cylinder heads.

I basically deepened out the slot to allow for twice the duration that stock and I'm very satisfied with the modification. There is now an adequate amount of oil flowing from the rocker arms, 1. protecting the parts better and 2. cutting down on sludge forming because oil flow has been increased.