I've got a TR4 w/.100 off the head and Kastner D cam and headers here in
Colorado (just over 5,000 ft.). I'm running Champion L87YC plugs and am
thinking of trying something colder as sometimes there is pinging when I'm not
on it. I see Champion makes an L86C but I have no idea how much colder this
compared to the L87YC. Anyone have any input?
Thanks,
Dan Forgey
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