I have a '59 235 and it does not have a "road draft tube" but does have a vented oil fill cap on top. The block has a freeze plug where the tube would go. Do I need to have a vent for the lower crank case or will the top oil cap vent suffice for the engine? The engine is a complete rebuild. Photo attached.
235 engine

Any help is appreciated.

thanks

Last edited by coralhead; 01/29/2012 2:55 AM.