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Thread: 460 spark plug???

  1. #1

    460 spark plug???

    i want to replace the Autolites with NGK - V-Power...

    so.... if you go online to autoparts or even NGK they say the NGK 6630... i even ordered and they are 14mm thread

    the plugs are 18mm? it looks like the right one is a WR5 - 2438

    can anyone confirm the proper NGK model number? ...or recommend another

    thanks in advance!!

  2. #2
    78hallett's Avatar
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    Re: 460 spark plug???

    Depends on what heads you are running.

  3. #3

    Re: 460 spark plug???

    Quote Originally Posted by 78hallett View Post
    Depends on what heads you are running.
    hhmmmm not sure what they are... new to me boat and performance engines

    can i find out somewhere on them?

    guess best to match the autolite number?

  4. #4
    78hallett's Avatar
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    Re: 460 spark plug???

    head ID number is below the valve cover right above the exhaust port.

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  5. #5

    Re: 460 spark plug???

    here should be a cross reference sheet http://www.sparkplug-crossreference.com/ you will need the make and number off your old ones

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  7. #6

    Re: 460 spark plug???

    great thank you! will look tonight....

    found a prior owner... was bored and different heads... he is to send me some info

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  9. #7

    Re: 460 spark plug???

    As long as you don't use the Autolite like I had...
    Click image for larger version. 

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    AG6= Amazing Grace VI *
    1980 BIESEMEYER 27' VIKING

  10. #8

    Re: 460 spark plug???

    In my stock 460 I had Autolite 26 plugs, I recently changed them out to Motorcraft ASF42C.

  11. #9
    78hallett's Avatar
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    Re: 460 spark plug???

    Ive had good luck with NGK UR4's (6630).

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