Piston Slap
If the car is fully warmed up, in Closed Loop and showing Knock Retard on a scanner, then I would start looking. There are cars out there that sound like a Diesel.
My Formula did the same thing, and this is my 2nd LS1, so I'm sure it is common. Though my uncles Z28 doesn't do it, fiances fathers vette doesn't do it... Just my luck. LOL
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My '98 is slap free though. My '99 and '00 were also slap free. Just the luck of the draw I guess....





