??!!!   Never even heard of these before.  Does anyone have any experience with, or knowledge about them?  Maybe a stopgap/first-step gimmick for the common plugged oil passage problem, before installing the bypass kits so popular in the 60s?  If you repeatedly removed the covers and soaked the pads in oil, it might extend the life of your valve gear (assuming you burned/leaked enough to avoid overfilling the crankcase)?

www.ebay.com:itm:1954-64-Ford-Y-block-Valve-Cover-Silencer-Pad-Vintage-Accessory-NOS-:152139070590%3Fhash=item236c31fc7e-g-4xoAAOSw-4BXY0Mx&vxp=mtr.webloc 

6 VOLTS/POS. GRD. NW INDIANA