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Thread: Difference between 7mm and 8mm spark plug wires

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    Default Difference between 7mm and 8mm spark plug wires

    What is the difference between 7mm spark plug wires and 8mm? 7mm is the factory size, and Ive read on here recently that 8.5 is too big without an upgraded ignition system. I was just curious because I have read on here that everyone uses 8mm, so I went to several stores around here to get the 8mm ones and no body carries them, they have to order them in. I was just wanting to know the difference before I have anyone order them or I buy the 7mm ones. Thanks
    My daily driver, 14x3 open element filter, shorty headers, cat-delete, magnaflow y-pipe, 3 inch pipe from y-pipe back to spintech 6000 pro street series muffler

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    grapejuice1998's Avatar
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    The difference is 1mm. You can thank me later.


    BTW-I use the 7mm Mopar wires on my 408. They work great!
    Alan Short
    D.R.T.C. #15


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    Quote Originally Posted by grapejuice1998 View Post
    The difference is 1mm. You can thank me later.


    BTW-I use the 7mm Mopar wires on my 408. They work great!
    LOL

    Ya beat me to it!

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    LOL ok, I figured that much, I was just wondering if there really is an advantage to them. Thanks for the super easy answer lol
    My daily driver, 14x3 open element filter, shorty headers, cat-delete, magnaflow y-pipe, 3 inch pipe from y-pipe back to spintech 6000 pro street series muffler

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    I'd think the resistance per foot is more important than the diameter of the wire.

    For what it's worth, I really like the firecore 50s, and won't buy another brand wire again. Great fit, they feel good in my hand, and you can feel them "click" into place and there's no question on whiter they're on or not, plus I know the owner, Rick. Great guy, awesome customer service, and he's a mopar guy too. Owns a rare 71 GTX w a factory sunroof option. And he's right here in Ohio. Stop by his trailer at Carlisle, Nats and other races, Rick will offer you a beer, shoot the bull, and flat out take care of you.
    --Tom



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    Quote Originally Posted by 70Cuda383 View Post
    For what it's worth, I really like the firecore 50s, and won't buy another brand wire again. Great fit, they feel good in my hand, and you can feel them "click" into place and there's no question on whiter they're on or not.
    Plus he makes them a tad longer so wire looms can be used for a clean look.
    Dakota For Life!

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    Firecore 50s FTW!
    11.29 @ 117.83 All motor on Mars

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    I could never get that asshole at Firecore to build me a set of wires.
    Alan Short
    D.R.T.C. #15


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    Quote Originally Posted by grapejuice1998 View Post
    I could never get that asshole at Firecore to build me a set of wires.
    That's nuts, I have two sets....When was the last time you tried?
    11.29 @ 117.83 All motor on Mars

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    Quote Originally Posted by Adobedude View Post
    That's nuts, I have two sets....When was the last time you tried?
    I called back in Feb when you gave me his number. He said he was totally out of wire, but would keep my number and call me when he got a new supply. He called about 9:PM on a Sunday night in May, but I didn't recognize the area code, so I let it go to voice mail. He left a message that I should call him immediately to give him my CC and he would ship them. I didn't call until the next day..and the day after and the day after that, but he never answered the phone and he never returned my call. So...fuck him.
    Alan Short
    D.R.T.C. #15


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