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I'd really like to know, from a physical standpoint, what negative effects the shorter plug has on the motor/performance. Yes, I agree that it is best to stay with stock design on things like this. However, seeing high HP dynos from cars with copper plugs and not seeing any "my 6th piston melted from using copper plugs" posts makes me wonder how bad it really is to run a shorter plug. Like I said, I now run the 6b's.
Later,
Matt 
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