Is this plug fouled?

Is this fouled? There is a greyish buildup on the top and the base of the plug is all black. i have also heard bad things about Bosch plugs in lt1s. could this be the problem? Thanks guys
I was given a set of those plugs and I thought they were WAY to expensive.
The ONLY plugs I use are TR55 or autolite 106 and that is from NA to 15 psi boost...Who tuned your car btw?
I was given a set of those plugs and I thought they were WAY to expensive.
The ONLY plugs I use are TR55 or autolite 106 and that is from NA to 15 psi boost...Who tuned your car btw?
Right now, I'd say a little rich.
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