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Looking to cross reference an Autolite racing plug with an NGK plug

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Old 03-09-2012, 03:58 PM
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Default Looking to cross reference an Autolite racing plug with an NGK plug
Here's the cross reference chart but I don't see a listing for an NGK TR55 or TR6. Looking for an Autolite racing plug for a CR ~11.6:1. Anyone using the Autolite racing plugs? Thanx
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Old 03-09-2012, 08:58 PM
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I ran the XP104 in my LE2 LT1
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Old 03-09-2012, 09:28 PM
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AR103 for TR6 (that's in your chart)
AR104 for TR55
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Old 03-09-2012, 09:34 PM
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we run ar3932's get them from advanced for 2.90 a plug.
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Old 03-09-2012, 11:03 PM
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those are a gasket seat plug, .750 reach ^^
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Old 03-10-2012, 03:33 PM
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Originally Posted by BIGCAT7274
we run ar3932's get them from advanced for 2.90 a plug.
Originally Posted by Wicked94Z
those are a gasket seat plug, .750 reach ^^
The gaskets are used for indexing correct? I figured since the electrode was cut back on the 103's it would be unnecessary since the spark was almost unshrouded.
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Old 03-10-2012, 03:36 PM
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^ It depends on the head style. Factory heads (IIRC) call for a tapered seat plug while many aftermarkets (I know my DART's and my buddy's TFS heads) call for a gasket seat plug. We both ran tapered plugs to only find out we should have been using gasket plugs Did not damage the heads though (from what we could tell).
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Old 09-14-2012, 04:36 PM
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Originally Posted by bowtienut
AR103 for TR6 (that's in your chart)
AR104 for TR55
No one seems to have AR104's. Only AR103's.

I've tried Summit, Jegs, NAPA, Advanced Auto, and even sparkplug.com.

Anyone got any ideas? Thanx
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Old 09-14-2012, 05:33 PM
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Youll laugh But WalMart maybe???
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Old 09-14-2012, 05:43 PM
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Originally Posted by warriorcustoms
Youll laugh But WalMart maybe???
Nope. Thanx though.
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Old 09-14-2012, 09:36 PM
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AR94 would be the one I would run. In fact, it is the one I run.
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Old 09-17-2012, 10:13 AM
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Originally Posted by Longbob
AR94 would be the one I would run. In fact, it is the one I run.
Is it tapered to fit the stock GM head? And what's the heat range?
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Old 09-17-2012, 11:55 AM
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i run the AR473's.........no issues great plug and cheap......summit carries pretty much everything lol
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Old 09-17-2012, 07:42 PM
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Originally Posted by BIGCAT7274
we run ar3932's get them from advanced for 2.90 a plug.

Just curious on why you are running that plug? That is the plug I run in my race car with 900hp worth of nitrous... it's a pretty cold plug.
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Old 09-17-2012, 08:13 PM
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Originally Posted by fergymoto
Just curious on why you are running that plug? That is the plug I run in my race car with 900hp worth of nitrous... it's a pretty cold plug.
It's a Vortec YSI supercharged car.
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Old 09-18-2012, 07:01 AM
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Originally Posted by Rob94hawk
Is it tapered to fit the stock GM head? And what's the heat range?
Yes, they are the tapered fit plugs for the factory GM head. I use them in my Stocker and Super Stocker. They are great plugs for our application and the proper heat range.
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Old 09-18-2012, 07:06 AM
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Originally Posted by BIGCAT7274
we run ar3932's get them from advanced for 2.90 a plug.
These are gasket seat plugs and not the tapered seat plugs for a factory GM LT1 head. They don't fit properly.
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Old 10-04-2012, 04:32 AM
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Originally Posted by Longbob
AR94 would be the one I would run. In fact, it is the one I run.
Originally Posted by Longbob
Yes, they are the tapered fit plugs for the factory GM head. I use them in my Stocker and Super Stocker. They are great plugs for our application and the proper heat range.
The problem with those plugs is they are non resistor plugs. Thought these were no recommended for daily drivers.
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