MP valve covers knock out machined for pcv grommet (Chevy style)

Rock Able said

I installed the Catch Can today. I have a baffle 3/4" below my PCV, so anything I'm picking up is vaporized mostly. After driving about 20 miles and "getting on it" 3 or 4 times, I pulled the canister off and there was a small puddle of oil in the bottom. This engine has about 800 miles on it. I hope this gets better but I am convinced that adding this catch can is going to help my preignition situation and keep the engine cleaner.

Is this a problem more associated with Mopars? I've never noticed a problem with my SBC's. Thanks again for the recommendation.

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as far as I know, it is not a mopar specific problem. It probably has more to do with epa regulations and trying to really curtail hydrocarbon emissions, not just from the tailpipe, but from the fuel tank, and engine crankcase as well. With FI, engines run pretty clean, but sludge can form in engines which don't reach operating temp for long enough period of time to burn off moisture in the engine/engine oil. This can form a sludge, some of which you might see on the oil filler cap.
As far as SBC being immune to this problem, you can go on the Internet and see videos of GM owners trying to clean that stuff out of the intakes with Seafoam, and other chemicals.