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how to tell if I have 8:1 spark plugs or 7:1?

Discussion in 'Series Land Rovers' started by Landyfella, Jul 23, 2020.

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  1. Landyfella

    Landyfella Member

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    The plugs that came out are NGK bp5es.

    thanks.
     
  2. Mark Frewin

    Mark Frewin Member

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    Hi These are for the 8.1 same as Champion N12Y. The 8.1 head has markings on it just next to the carb next to one of the cylinder head bolts a figure of eight.
    7.1 uses Champion N8 or the NGK Bp6es this is according to land rover handbook
     
  3. Landyfella

    Landyfella Member

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    Thx. My head has 7h on it so must be 7:1?
     

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  4. Mark Frewin

    Mark Frewin Member

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    In your second picture right next to 7H on the raised part just in front of the bolt head is a faint 8. Its large and sort of engraved. You have the 8:1 head so your plugs are correct
     
  5. Blackburn

    Blackburn Well-Known Member

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    Maybe someone had the head skimmed to give 8:1.
     
  6. Mark Frewin

    Mark Frewin Member

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    I think the 7H is just a casting mark. The 8 is the same as my spare cylinder head. Pic attached 20200723_214346.jpg 20200723_214346.jpg
     
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