ORIGINAL: Mike Connor
Just take the head off and turn the sleeve so it is symmetrical when looking into the exhaust port. Re torque the head bolts and you will be ready to go. This may have been caused my a lean run but that does not necessarily mean your engine is damaged. The last owner may have thought he was unloading a problem but it may be a very good engine.
If so 0-cool may be the recipient of a very good deal! I'm putting my SJ .50 in the SD now, after the West exhaust header came apart right by the weld on the flange last night. It will be nice to have some midrange.
MJD