A few weeks ago i had a hissing in the engine a sparkplug ripped through the hole and striped the threads so i found out it can be repaired with a heely coil or smartstem but theres only one chance to do it right or ill have to take out the heads so i took it to a good buddie of mine at Corvettes of westchester in ossining ny they are working on it now ill let you know what the end results are in an hour or so.I need my baby back so pl wish me luck...fingers crossed