Iâ??ve used Champion N7YC in the past. Got them at an ear by auto parts store.
Donâ??t remember which. They work well with a HEI.
Dick
> On Jun 6, 2023, at 2:41 PM, Rochlin Robert <rrochlin@comcast.net> wrote:
>
>  Iâ??m looking for a spark plug that is just a little cooler than the
> stock Champion N9YC plugs that Iâ??m running. Iâ??ve had no luck finding
> Champion N8YC plugs and each manufacturer has a different designation for the
> heat range for their plugs so itâ??s hard to do a direct comparison . Does
> anyone have a source for cooler plugs? Iâ??m not concerned if they are not
> Champions.
> Best,
> Bob
> â??72 TR6
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