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    Cylinder heads of my B&S engine made of cast iron or aluminum? This determines torque for plugs

    Hi all, Here is a dump of information in hopes someone is bored and/or helpful enough to base an analysis on any of it. The manual for my beloved old family mower says the spark plugs should be changed every season. After 30 seasons, I think it's time. I'd like another 30 on this old nag...
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