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Thread: Plug gap
          
   
   

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  1. 10-14-2007 06:04 PM #1
    Motown
    Motown is offline CHR Member
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    Plug gap

     



    Hi every one, i am trying to find a good plug gap, for my chevy 350

    1969-1979 355 cid
    63 cc performer heads
    204/214 edelbrock cam
    mallory unilite dist
    edelbrock performer manifold and 600 carb.

    right now i have them gaped at .45 just don't know if it is right.
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  3. 10-14-2007 06:12 PM #2
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    pat mccarthy
    pat mccarthy is offline CHR Member/Contributor
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    i run .035 with my msd . your unilite dist they should tell you how much if you have any instructions if not call mallory . it will run on .035
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  4. 10-14-2007 06:16 PM #3
    Motown
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    thanks for the info, i'll try .35 see how it runs
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  5. 10-14-2007 06:40 PM #4
    BigTruckDriver
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    http://www.4secondsflat.com/Spark_plug_reading.html
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  6. 10-14-2007 08:11 PM #5
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    skids72
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    I used to run at .042... MSD at 10.2:1 SCR with no problem. I've been told a bigger gap is touger on the coil and at higher compression there's more chance of misfire with bigger gaps so I've been at .035 with my new motor (10.8:1)... haven't tried much wider but I don't think there's any more power on the table...

    I think .045 is probably fine for you but .035 would work more reliably and I don't think you'll find much performance difference between the two.

    BTW: Thanks BigTruckDriver on the plug reading reference... I've seen a few of these for different applications but the one you reference is great.
    Last edited by skids72; 10-14-2007 at 08:15 PM.
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