y block oil pressure

[cvicky]

10w30 multy grade I have oil lines going in valve covers also

[dmsfrr]

Originally Posted by cvicky

... I have oil lines going in valve covers also

A lack of oil to the rocker arms due to sludge buildup may not be helped by the oil passage at each head gasket.

The oil comes up from the center cam bearing in a 5/16" hole. (photo 1) At the head gasket the passage turns 90* into a shallow groove. (photo 2) Then another 90* turn up into a 1/4" hole thru the head to the rocker stand. (photo 3)

The groove in the underside of the head may be slightly shallow (1/8" ?) which could be a problem by itself (esp if the head has been re-surfaced) and if a composite head gasket swells into it, it is now even smaller.