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Generation III Internal Engine 1997-2006 LS1 | LS6
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allen plug size

   
Old Apr 14, 2008 | 01:29 PM
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Default allen plug size
anyone know what size plug to get for the pass cylinder head?
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Old Apr 14, 2008 | 02:16 PM
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If I'm not mistaken, its a 3/8 sparkplug socket.
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Old Apr 14, 2008 | 02:20 PM
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Originally Posted by ss.slp.ls1
If I'm not mistaken, its a 3/8 sparkplug socket.
I think he's talking about the coolant plug on the head. I could be wrong though. If so, I'll look when I get home since I had to grind the Allen wrench down to fit back there.
Last edited by NOZR1; Apr 14, 2008 at 03:04 PM.
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Old Apr 14, 2008 | 02:24 PM
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Originally Posted by NOZR1
I think he's talking about the coolant plug on the head. I could be wrong though. If so, I'll look when I get home since I had to grind the Allen wrench down to fit back there.
I think you are right, my bad, sorry for my stupid reply.
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Old Apr 14, 2008 | 02:38 PM
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Isn't the hole a 12mm 1.5 pitch?
Last edited by 67rsss; Apr 14, 2008 at 09:05 PM.
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Old Apr 14, 2008 | 04:13 PM
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yeah the coolant plug in the head, myfault for not being specific, my heads didnt come with one
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Old Apr 14, 2008 | 04:28 PM
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I thought it was a tapered thread, part # for plug per my notes is 12553191. Make sure you verify the part number though.
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