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

86 best plug

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Old Apr 8, 2007 | 10:15 AM
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Default 86 best plug

What is the best spark plug for everyday driving. 1986 L98
Thanks Larry
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Old Apr 8, 2007 | 10:27 AM
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The stock AC Delco plug.
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Old Apr 8, 2007 | 11:23 AM
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Originally Posted by rspreng86
The stock AC Delco plug.
AC Delco is the way to go!
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Old Apr 8, 2007 | 12:07 PM
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I have Bosch Platinum +4. Mostly because I want fouling resistance, longer life and no gapping.

Worth the $6/plug? I dunno. Not for performance gain. Not even emissions gain.
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Old Apr 8, 2007 | 12:17 PM
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regular old AC Delco rapidfire
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Old Apr 8, 2007 | 12:54 PM
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Originally Posted by vader86
regular old AC Delco rapidfire
rapidfire #5 on my 87, no problems good results and it works
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Old Apr 8, 2007 | 06:29 PM
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I used the regular AC plug, but whatever you do, make sure you have the right plug for your engine. In 86 they switched heads from iron to aluminum and they are different plugs. The owners manual that I have only had the plug number for the iron head engine. As a result, my car had the wrong plugs in it when I got it. I replaced them with the right plugs and got 2mpg better.
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Old Apr 8, 2007 | 07:06 PM
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Delco's with cut back electrodes.
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I like NGKs. They seem to work great for me. I don't see the sense in plat plugs since I try to change my every year or so.
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Old Apr 8, 2007 | 09:50 PM
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Originally Posted by jimmers
AC Delco is the way to go!
I went to stock factory plug in my 84,and it seems to run better everyday. A/C Delco
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