Thread: Spark Plug Query
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Old November 23rd, 2016, 12:22 AM
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Default Re: Spark Plug Query
I just looked at RockAuto site. They list a 3/8" length thread and a 3/4" length thread for the same 61 305 motor. Don't know why. Wait for a guru to reply with the answer. I assume both will be OK or Rock Auto is wrong. See if you have one of each length. Both gapped at .035/.036. Give us the numbers of the two plugs you have. Who bought the plugs? you, the mechanic, already had them in truck?
Last edited by AZKen; November 23rd, 2016 at 12:30 AM.
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