As the power output on modified LT1 and LT4 engines increases, the need for proper crankcase ventilation becomes more and more important. Pressure that cannot easily escape though the valvecovers and valley cover will eventually end up passing the rings (blow by) or passing through front and rear seals causing pesky leaks. We’ve already experienced newer Corvettes having oil leaks from front and rear seals as a result of inadequate crankcase ventilation.
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