Look in the Pegasus catalog- probably on line too. They have a great chart for
champion spark plugs, showing all the models ranked hot to cold. Was literally
just looking at it this afternoon.
Sent from my iPhone
> On Apr 27, 2018, at 2:24 PM, Dan Forgey via Fot <fot at autox.team.net> wrote:
>
> 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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