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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 1985gmc1500 on April 16, 2016, 01:18:29 pm
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Hi The stock spark plug wires on my 1985 GMC Sierra 305ci are 8mm. I am running the wires via looms that bolt onto the valve covers. Since this is not the original wire routing the stock plugs you can buy will not fit correctly I am looking for red wires that I can cut to my own length and will fit on the stock distributor. I can not find these in 8mm would it be ok to use the 8.5 mm that msd sells?
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Using 8.5 mm MSD wires is fine, but first make sure the loom clamps will accept the larger diameter wire. I also recommend MSD's terminal crimpers, or similar, to properly crimp and permanently secure the ends without damage.
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I used the 8.5mm MSD red wires you speak of. I cut and crimped every single terminal my self using terminal tool WT 105 from Matco tools. They are good quality. I even used the extra wire and made a spark plug wire test wire for problem diagnosis.
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the mm size really doesnt matter, it just thicker insulation, More of a marketing gimmick,