I found a trick on another forum to keep the oil out of there. Where the hose goes into the valve cover there is a plastic 90* elbow. You can replace it with a breather filter from Advance or AZ that will plug right into the valve cover and the hose, and it keeps the oil out of the TB.
As for TPIs, I thought they used the same TB as LT1s too, maybe the PCV system is different.
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