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Only reference I could find on the 295. Pete post 8#. Probably for what you are doing is not necessary. Don't over think it. Normal plug will work for most everyone. Clean it. Putting a different plug in is about as effect as replacing the regular plugs on a tuneup. Plugs will not give you that much or any hp less you have something else going on. Need to do more.
https://www.jalopyjournal.com/forum/...-using.255112/
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