BREATHER AND PCV SYSTEM
The driver's side valve cover that came on the crate motor is setup for EFI and completely closed, so there is nowhere to stick a breather or PCV valve. The passenger side valve cover has an oil filler neck with oil cap and a hose barb on that neck. Typically, with a carbed engine, there would be either a vented cap, PCV valve, or hose running to the air cleaner or carb on both valve covers depending on the setup.
AIR IN, AIR OUT
Both sets of valve covers in the pictures have the same finish so I am not sure why the pictures on Summit look different. What I ended up doing is buying this valve cover set and switching the driver's side valve cover to add a PCV valve that hooked up to the carburetor. (Air Out) I liked having an actual oil filler cap and not having to remove a breather to add oil, so I left the passenger side valve cover where it was, and ran a hose from the oil filler neck barb to a port on the air cleaner assembly. This side could act like a crappy crankcase vent since air might be pulled from the valve cover into the air cleaner assembly by the carb. I doubt this though because the carb will pull from the path of least resistance. The path of least resistance is through the K&N air filter rather than through a two-foot section of 3/8" hose from the valve cover. On the other hand, clean air can pass through the air filter then through the hose, and finally into the valve cover which is what I was going for. (Air In)
I remember having problems getting a grommet that would fit the PCV valve. In my parts collection, there is a M-6892-C Grommet Set label that may or may not have had the right one. I think I had to call Ford Racing and they sent me the correct one. If I had this website at that time and was keeping track, I would know. That's another reason I am dumping all of this information here.
This gives the engine positive crankcase ventilation, and I still get to keep the fancy oil cap that came with the overpriced crate motor. The engine idles nice, so this system seems to work out well.
This gives the engine positive crankcase ventilation, and I still get to keep the fancy oil cap that came with the overpriced crate motor. The engine idles nice, so this system seems to work out well.