John Mummert lists the Neoprene Ones on his Website. As a matter of fact those are the only Ones He lists.

  

Update.   Still dripping Oil after blowing out drain Backs. Oil is not draining as fast as it should. How far back in the Head is the "down" for Oil. Not at the end so it must be around middle somewhere. Must be something stuck blocking the "down" opening. Going to try a piece of wire if I have an Idea where the opening is.

  

Both heads have s drain hole at both ends.
The drivers side head would have the rocker drain tube at the rear and the passenger would have it at the front.

Are your rockers with higher flow or pressure oil than stock? Possibly overfilling the heads?


1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1977 Ford F-250 Supercab RWD Explorer Long box.
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1

No just regular pressure. I have used Air to blow out the Drains at front and back but still not draining at rear which is where its dripping. The drain goes straight in but how far back into the Head is the "down" run?

  

It's odd that both covers are leaking. Is it possible they have pinholes in the casting ?
What is the head valve cover gasket surface like at the back edge ? is it rough ? missing some ? big bumps ?


1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1977 Ford F-250 Supercab RWD Explorer Long box.
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1

Its just the One on the Left Side. Dripping down the side of the Head below the Cover..

  

Those end holes at both ends of the head go into the lifter valley if you have a long enough tool.  The holes are huge in terms of oil drain back area, and should be able to drain the area easily.  There could be an umbrella seal piece lodged deeper down where the head gasket mates to the block.  If you push it in, you will need to remove the intake, valley cover, and clean out the debris so that it doesn't clog the oil pick-up screen or worse get sucked into the oil pump and stop the rotors.  If you have a scribe with the 90* end you might be able to retrieve the blockage if that is the case.  Just some ideas.  Joe-JDC

JDC

Hi Joe. I just took it apart again. Using a piece of Coat Hanger Wire I was able to get in about 7 inch's. Seemed very narrow about half way. Just big enough to get Coat hanger through. It was I think plugged up until I worked the Wire through. Is there a very tight Area normally? Feels like part of the Head Casting maybe. Going to go for a Drive later and see if there is Oil drip in AM. Thanks

  

Tim McMaster has a YouTube of an engine running with the rocker arm shaft overflow tubes blocked. It shows how much oil the drains in the heads to the valley can take. Sounds like something else is the cause…

56 Vic, B'Ville 200 MPH Club Member, So Cal.

If the oil system is modified to increase the amount of oil to the top end of the engine, then the potential for the oil to be above the cylinder head valve cover rail is greatly increased.  I find it necessary to install restrictors with a 0.078” orifice at each rocker arm assembly to control the amount of oil that gets to the cylinder heads when making modifications to increase the oil flow around the center cam bearing.

Lorena, Texas (South of Waco)