Colder spark plug info

Can anyone give the part number for a colder plug than a AC/DELCO R44LTS.

Long story short... I want to switch to a colder plug to troubleshoot the pinging in my Explorer 94.

Thanks,

Sam in Raleigh.

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Sam
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Sam, When you go to buy the new plugs, just ask the parts store for the next step cooler plug...

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351CJ

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