[7000rpmisheaven]

I only began to work on cars about a year ago. So I don't know these things. I have another question. I stumbled across a site today about spark plugs. It seems to me that the spark is one of the key parts of the cumbustion process. Yet I don't know how to pick the right set of plugs.

I tried to figure this one out on my own but I just got more confused. I understand how to properly set the gap. but what heat range or shape or type.