When I had my manifolds off...I noticed something weird while looking at the exhaust ports. They weren't all black. There was some white on the edges of the exhaust ports and sometimes on the whole port, not just the edges. Anyone have any ideas what this could be or if its normal? Did anyone else notice this??

 

Coolant leak (head gasket), condensation

 

What makes you conclude this? I was thinking more along the lines of a lean condition.