On Wed, 18 Jan 2006 13:40:21 -0600, Mitty wrote:

In pushrod motors the rocker arm noses running
against the valve stems are splash oiled. Also the timing chain(s), the
distributor drive gear, ... Pretty much it is only the bearings that are
pressure oiled. i.e., mains, rods, cam(s).

The engines pushrod engines I've assembled had hollow pushrods and fed
pressurized oil to the rocker arms. The rocker arms were hollow and
injected oil onto the valve stem to assist in cooling. Yes, the top
of the valve stem did not have any direct injection so it did require
splash oil for it's lubrication. That's where roller rockers help.

Guess I hadn't thought that much about it for a long while. I stopped
working as an auto mechanic a long time ago.

Corky Scott