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Old 08-25-2006, 03:53 PM
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SBC valve cover ventilation questions?

O.K., I have this old 383 stroker built on a 1970 LT-1 block, 2.02 fulie heads, don't know what cam (mild, 13hg vacuum at 850rpm idle), air-gap and 750 holley. The valve covers are old Corvette look a likes, ribbed. Passenger side has no oil fill, does have a PCV that is hooked to manifold vacuum. Driver side has oil fill cap, and an elbow that had a hose that went to the air cleaner. When I got this car out of storage, the carb was black inside from all the oil it was being fed from the driver side cover, at least that is what I assumed was going on. I plug the hole on the valve cover and removed the hose after rebuilding the carb (since switched). Anyway, though I should ventilate the driver side, but when I put a filtered breather on it, the darn thing fills with oil after a couple hundred miles and leaks on the headers (stinks)! I did some research and found out that the new oil pans have a baffle to keep oit from entering the filter. I don't really want to change the valve covers. Does it hurt to have this plugged? Is there another way to deal with this?

Thanks in advance for your assistance!

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Old 08-25-2006, 04:18 PM
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Moroso has some breather caps that will probably bolt to the hole. I have a set of 69 vintage with the baffle and the Moroso one covered the hole. They are foam filled and should keep the oil dripping inside, not on the headers. You might have to occasionally wipe the cover groves. You have some old covers if they do not have the built in baffling. I got an air cleaner and pulled the tube with a screen on it and positioned it so the tube was as high as possible once. I found venting to the air cleaner on one side and a pcv in the other side worked the best.

If you are having a lot of oil fumes, you might have worn or sticky rings or low tension molly rings. I suggest you try some GUNK 5 minute engine flush. You run this in your oil for 5 minutes and drain it. This sometimes will loosen up the rings and it cleans out some crud in the pan too. Berryman's Injector cleaner works too. There is directions on crank case flushing on the can.
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