I removed these lifters and trays from a 2002 Camaro LS1 with 59,000 miles.  The engine was running fine with these lifters and trays.  I had the engine out to put into another LS project car.  I removed them when I was replacing seals and gaskets.  They could have stayed in the engine and it would have been fine.  Look at the pictures. I am selling as is.  I only accept PayPal. Email me with any questions. Thanks.  Free shipping.