x2. The Autolite is a better plug than either the NGK or the Delco. I had a friend that was knocking the tips off of NGK's in his 17-1 compression race bike. A racing companion told him to go to Autolites and he didn't have any more plug related issues. If you use nitrous never use extended tip plugs.
Use Autolites if you want to change plugs every 20-30 passes Thats my experience with the Autolites and their cut back electrode. I can run two sets of NGK's all year long now, same with Delcos when I had iron heads.
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