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

92 lt1 spark plug choice??

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Old Mar 7, 2012 | 10:22 PM
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Default 92 lt1 spark plug choice??

Hey guys looking to put a new set of plugs in my 92 lt1 vette,in place of the factory plugs,its got bolt ons and some other mods,what's a good hotter plug to jump up from stock.any opinions appreciated.

thanks mike
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Old Mar 7, 2012 | 10:29 PM
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If by hotter plug you mean a hotter heat range, this is probably not at all what you want, as this can cause pinging and possible engine damage. If by hotter you mean makes more horsepower, hate to break it to you, it's not that easy.

Factory plug is the AC Delco 41-906 I believe but wouldn't swear to it. Lots of people, myself included don't like the delco platinums. NGK makes a quality plug, the TR55 which is what I use. Delco non platinum R44LTS is a good plug, as is the Autolite 106.
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Old Mar 7, 2012 | 11:39 PM
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I've used the NGK TR55's and Autolite 606's in my '93 LT1 with no problems.
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Old Mar 8, 2012 | 11:27 AM
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NGK TR55v here. I used them when the stock engine was in and use them on the 383.
Wife's 04 Corvette uses the NGK TR55g

Do not use BOSCH - In my experience they don't work very well and you'll be replacing them soon after you put them in.
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Old Mar 8, 2012 | 03:26 PM
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yeah i know im not gonna gain horsepower from this,just want it all to burn cleaner.looks like ngks it is.

thanks everyone Mike
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