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Old 08-13-2010, 04:41 PM
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What plug gap?

Have a 350 Chevy with the following specs, need to know what to set plug gap to.

-1988 350
-9.5:1
-Vortec Heads with new Champion Plugs (Made sure they are for vortec)
-MSD StreetFire HEI Unit, Upgraded with Advance curve kit, MSD Green Module (Not the new red ones), MSD 8225 Coil, Brass Terminal Cap/Rotor
-Taylor 8mm Spiro Pro's

What should i be setting my gap to?

Thanks!

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Old 08-13-2010, 04:47 PM
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0.060" Yes sir.
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Old 08-13-2010, 04:48 PM
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wow, i was running .040 before, thanks!
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Old 08-13-2010, 05:05 PM
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.060" is mostly an emissions spec, performance specs are between .025" and .045". .040-.045" would be appropriate in your case. Running an extremely large spec like .060" is just hard on the secondary ignition system parts - the cap, rotor, rotor button, coil, plug wires as it raises the resistance at the plug a great deal with no real positive effect on engine performance.
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Old 08-13-2010, 05:11 PM
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I'm just going by what the service manuals say.
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Old 08-13-2010, 07:34 PM
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I like .035 myself. MSD, mech pro billet,Auto lite R25, 10.5, radical cam, 383.
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Old 08-13-2010, 10:28 PM
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i have them gapped at .040 at the moment, Just leave them?
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Old 08-13-2010, 10:47 PM
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Sure why not MSD will handle that just fine .
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