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What he said. The LT1 has a small ring gap. If the tune is too lean the extra heat can cause the rings to expand to the point that they close the gap and damage the piston. Excessive crankcase pressure can be an indication of ring and piston damage. You will want to do a compression check. This is a more common problem with boosted LT1 engines and there are numerous threads where others have run into this problem with the LT1.
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