The Stovebolt Site Forums The Shop Area Engine Shop 47-55 1st, Are there 2 types of breather pipes ?

As bowtietim observed above, the second picture in the first post has a 54/55 standard valve cover. These had 4 slits in the valve cover and had no need for a vented oil filler cap.

A PCV system needs to be sealed, so in 54/55 a non-slits valve cover was used with the PCV system. There was a hole on the carburetor side of the valve cover for one of PCV hoses.

From 1955-2nd onwards the standard valve cover had no slits (and the oil filler cap was vented).