"New engine, no PCV, blowing oil out the rear main like crazy and winter Frothing of oil."
Yep - I suffered with Rear Main leaks on my modded Pontiac 400 block. Especially after upping the horsepower. I tried everything - ditched the Rope Seal and went with Viton, tried various PVC set-up's, Catch Cans, etc.
I don't know what it is with Pontiac Engines making so much Crankcase pressure?
Finally went with a Butler Crankcase Evac Kit - expensive, but it works great. Problem solved.
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