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  • race1z06 ·
    Hi Guys,
    I am not new to this forum but I only have posted 1 thread about a year ago.
    I have a 2008 z06 with about 49k; the engine had a valve guide issue. I had a GM retailer conform my diagnostics; many of the exhaust valve guides had excessive ware/ play.
    After removing both heads and checking all the exhaust valves guides I found that 7 out of the 8 where completely worn-out.
    I also found that the main bearings had excessive ware.
    My experience with this GM product has been hirable, and the quality of the original LS7 block casting was extremely poor. There were casting flaws that measured 0.128, that should not be on what they say is a hand built engine.. I just did not trust the block would hold up to any high performance driving so I replaced the complete engine assembly.
    I decided to replace the complete engine with a NEW GM LS7 engine.
    Now that I have about 3k on the new engine the noise from the valve train has returned!

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