Quote:
Originally Posted by DanEC
Just to make sure you covered all the easy stuff first - could it be an exhaust leak on that bank. Header bolts have a way of backing off and gaskets or sealer get blown out. Itsi bitsi chance it could be something like that.
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Worth giving a good check
I dont have an SO engine but I just went through this. Friends thought it was valvetrain, but I found a header bolt rattled out causing gasket to fail. It's funny how bad an engine can sound with a bad gasket.