Not to the degree you described. I've had oil residue and carbon in the spark plug tunnel. I always torque my plugs as well. I am suspicious of the single-use crush aluminum washers, and those disappeared when I went to the N20 plugs. I clean the tunnel to where it is perfectly spotless, especially the base where the spark plug washer mates to the plug face on the head. This can take a while - carb/injector cleaner and a long, thin-tipped flat blade screwdriver (called carburetor screwdriver for us old guys) pushing a long, thin piece of cut rag. Obviously don't mar the head. This ensures the plug washer seats completely flat, and allows you to monitor any leakage going forward.
My experience, above, is not conclusive to me. Just my suspicion from what I've observed.
Spark plug change in the auto store parking lot, in the rain - that sucks.
Filippo
My experience, above, is not conclusive to me. Just my suspicion from what I've observed.
Spark plug change in the auto store parking lot, in the rain - that sucks.
Filippo
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