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o/T Autolite spark plugs 456 vs 458

Discussion in 'Off Topic Threads' started by new loader, Apr 18, 2009.

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  1. new loader

    new loader Member

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    Jan 29, 1998
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    498
    Can these plugs be interchanged in lawn equipment without much concern? They appear the same size, so must be heat difference? Which is hotter? Autolite shows interpretation for 4 digit plug, but no 3 digit info. Thanks to all.
     
  2. Husky44

    Husky44 Active Member

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    They should be fine. Beware Autolite plugs are now made in China and the quality has suffered. I only use Motorcraft or NGK's now.
     
  3. motordoctor

    motordoctor Shoji Tabuchi in Branson

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    when did they start making autolites in china????. they were made in the same factory as the motorcraft plugs in fostoria ohio. the higher the number the hotter the operating temp range
     
  4. Husky44

    Husky44 Active Member

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    I have no idea when they changed manufacturing location either, but I noticed the appearance in the plugs while changing a set at work and low and behold the box said made in CHINA!
     
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