C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Sparkplug Gap

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Old Apr 30, 2004 | 07:47 PM
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Default Sparkplug Gap

What would be the best spark plug gap in my stock 87 ? :confused:
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Old Apr 30, 2004 | 07:53 PM
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Default Re: Sparkplug Gap (Johns_87)

I have AC Rapidfires #5 and gap them at 43,,, and no problems
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Old Apr 30, 2004 | 08:25 PM
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Default Re: Sparkplug Gap (Johns_87)

Personally I like .050 on the rapidfires


Opening the gap is an old hot rodder trick but it does shorten plug life. Go with .040 if plug life is a concern...other wise .050 is sweet :D

:seeya

:steering:
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Old May 1, 2004 | 12:13 AM
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Default Re: Sparkplug Gap (Johns_87)

I went with the .50 Gap and very very happy with the results.I would also like to mention, that when I took off the plug wires I noticed 3 of them had been burned from heat. what I thought was a exhaust leak was a noise of the arc from the wire.This also solved a hard to start problem and fuel load up. I see guys post these same problems and come back with very costly repairs and maybe it could just be a wire. $100 in parts and she runs like a champ!!! Thanks,Guys :party:
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Old May 1, 2004 | 12:50 AM
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Default Re: Sparkplug Gap (Johns_87)

AC Delco RapidFire #5's gapped @ .045, no probs here either.
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Old May 1, 2004 | 02:20 AM
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Default Re: Sparkplug Gap (jvet)

I though I'd try .050 on the new plugs I just installed. After all I have a hotter coil installed. It ran OK. I then pulled the plugs out after 40 miles and tried the plugs at .045. It ran a little better and it felt stronger. I then tried .040 and ran it again. I did feel a little boost. I don't know if it was just psycological the last time. I did leave them at .040 and have no complaints.
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Old May 2, 2004 | 03:25 PM
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Default Re: Sparkplug Gap (VAHROOM)

i was told by 65Z01 to gap them at .035, is this right? i have bosch platinums!
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