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As many of you know, the PCV system on the 98-02 LS1's isnt exactly the greatest system on the planet.....burning up to 1 quart every 3K miles. After many complaints, GM finally issed a service bulletin to address this issue on all of the GEN 3 engines. They have replaced the ball-type PCV valve with a new fixed orifice design that is used in the GM trucks. This design will help reduce oil-consumption on your LS1.