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Old 10-10-2009, 03:08 PM   #1
longlive289s
3rd Gear Member
 
Join Date: Oct 2006
Vehicle: 1966, Ford, Mustang
Location: Bothell, WA
Posts: 752
Default gap size?

installed the mallory ignition box (hyfire vi 6al) with no problems (thanks kalli). mallory doesnt mention increasing the gap size but ive heard that a increase is recommended. i'm using simple copper core Autolite 45's that have a gap of .035. i'll tinker with em in the mean time but would something more like .045 be better and give a better burn now that i have a bigger spark?
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Rebuilt: Engine, Tranny, Suspension (Grab-A-Track)
Upgrades: Weiand Action Plus Intake, Holley Street Avenger 570CFM, Flamethrower Coil, Pertronix Distributor, Mallory VI 6AL Ignition Box, Hooker Comp Headers...and of course more to come

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Old 10-11-2009, 03:52 AM   #2
67mustang302
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Join Date: Apr 2007
Vehicle: 67 Mustang Coupe
Location: California
Posts: 7,341
Default

I have mine gapped at like .052 I think? I'd gap it to at least .045, it'll let you ignite leaner mixtures better. That's on a n/a engine though with typical street range compression. When you run higher compression and/or boost you need smaller gaps. Some newer cars are running gaps of .060 from the factory.
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