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  •  » Spark plug length boot question

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    2/09/2025 5:05 AM  #1

    RTM
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    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 1,777

    Spark plug length boot question

    I bought some cut to fit msd wires and had to return them.  The spark plug boots were to short and rested against the header flange.  The cheap Autozone fox body wires have a longer boot and don't hit the headers.  I don't recall seeing anything listed on boot lengths when looking at wires.

    Im trying to find out if the ones on eBay MS posted a while back in my old post have the longer boots and or what others may have a longer boot.

     

    2/09/2025 9:53 AM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,313

    Re: Spark plug length boot question

    Correct wires have a 135 degree angle built into the boot. Ones with 90 degree boots are for bowtie engines.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    2/09/2025 11:45 AM  #3

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
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    Re: Spark plug length boot question

    I have MSD 8.5mm wires, # 35383 on my 351W.  These have the flexible spark plug boot that can be bent to clear headers, or whatever may be in the way.  (and they were a lot less expensive when I bought them in 2007!)

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    2/09/2025 6:03 PM  #4

    RTM
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    From: Cape Coral FL
    Registered: 5/22/2019
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    Re: Spark plug length boot question

    MS wrote:

    Correct wires have a 135 degree angle built into the boot. Ones with 90 degree boots are for bowtie engines.

     
    After thinking about it today I may have ordered the 90's.    I need to look at what I returned.

    BobE, I need to look into those wires.

       •Thread Starter
     

    2/09/2025 6:41 PM  #5

    John Ha
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    From: Mitchell, SD
    Registered: 4/02/2013
    Posts: 950

    Re: Spark plug length boot question

    OReilly's sells a set with the angled boot for about $30.  I ran these on my 351 for a lot of years.  I don't know if they are the gender you need for the distributor end but thought I'd offer the input.

    Last edited by John Ha (2/09/2025 6:42 PM)

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    2/12/2025 11:36 AM  #6

    RTM
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    From: Cape Coral FL
    Registered: 5/22/2019
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    Re: Spark plug length boot question

    Looks like I had ordered 90 degree boots and not the 130.  Ugh.

       •Thread Starter
     

    2/12/2025 1:02 PM  #7

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
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    Re: Spark plug length boot question

    Make sure you can't use the 90's !....It depends on the fitment of the header-to-block. My el-cheapo Patriot Headers work better with the 90's on all butt-two plugs. Just FYI.......
    6sally6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    2/12/2025 6:41 PM  #8

    RTM
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    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 1,777

    Re: Spark plug length boot question

    6sally6 wrote:

    Make sure you can't use the 90's !....It depends on the fitment of the header-to-block. My el-cheapo Patriot Headers work better with the 90's on all butt-two plugs. Just FYI.......
    6sally6

     
    That was my mistake.  I had ordered the 90's instead of 130.  I had sent the 90's back a couple weeks back because they hit the headers.

       •Thread Starter
     

     

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