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Question:

How long can a valve cover remain off the engine?

I had to replace the gaskets on my valve cover only to discover that the valve cover had developed a hole due to oxidation. I waited a week for a new valve cover to come in and left the engine exposed. Should I have any issues? I mean its covered but its still outside. Should I pour some oil on the exposed part of the engine?Its been already about a week.

Answer:

So long as it is covered you will have no problems. The hood closed, maybe a rag over the hole... I wouldn't give it a second thought.
A clean dry towel over the exposed valve train assembly will keep the dust out. A closed hood will not stop dust from flying through the fender-wells, under the car and into the engine compartment. I have news for you: An electrochemical reaction is called corrosion. Your valve covers don't fall within that category. Valve covers are usually of stamped steel from gosh know where. I've seen and heard of oil pans rusting through on Ford cars and trucks but your issue is a first. I have a pair of 48 year old 300 hp. 327 stamped steel valve covers in the cellar with not a spec of rust on them. Along with that two pair of chrome 427 Chevrolet valve covers that are 45 years old with no rust. America has gone to hell in a hand basket when they started buying outsourced boiler plate steel.
yea it will be fine as long as you check the level and watch for bubbles of water on the dipstick after running it a bit, just change the oil and filter to insure you don't water foul a plug

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