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Spark Plug Gap for HP500?

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Old 06-21-2012 | 05:37 PM
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Question Spark Plug Gap for HP500?

Does anyone know what the gap should be for 1999 HP500 carb engines? I just bought Denso Iridium plugs and want to get this right.

Thanks!

Last edited by 242LS; 06-21-2012 at 05:43 PM. Reason: Typo
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Old 06-21-2012 | 05:45 PM
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.035
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Old 06-21-2012 | 05:49 PM
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Thanks LaVita.
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Old 06-21-2012 | 05:51 PM
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No problem.
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Old 06-21-2012 | 06:46 PM
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Should've asked yesterday!
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Old 06-21-2012 | 09:31 PM
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Originally Posted by lil red
Should've asked yesterday!
I figured they came pre-gapped. I was talking to I'CE today and he asked me what the gap was supposed to be - got me thinking. It turns out they were all at 0.35 already.

Now I have new plugs, wires, distributor caps and rotors. Looking for lost RPMs.

Last edited by 242LS; 06-21-2012 at 09:31 PM. Reason: Auto-incorrect
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Old 07-21-2012 | 01:44 PM
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thunderbolt IV and V found spec. @ .040 and sterndrives.com has spec @ .030 what gives ?

Last edited by I'CE; 07-21-2012 at 02:15 PM.
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Old 07-21-2012 | 08:03 PM
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Originally Posted by I'CE
thunderbolt IV and V found spec. @ .040 and sterndrives.com has spec @ .030 what gives ?
The merc flame arrestors have .035 stamped right on them
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Old 07-21-2012 | 10:31 PM
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Originally Posted by 32hustlin
The merc flame arrestors have .035 stamped right on them
Doesn't hurt to check.
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Old 07-22-2012 | 11:35 AM
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I have a question I just run the mr43 delco plugs what's the selling point with the iridium plugs do they not foul or just last longer
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