#8 spark plug

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avalonandl

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8.1 in an Avalanche. That plug was such a BEEATCH I ran it on 7 new plugs for a week, LOL.

I changd plugs at 75k miles on my Av ad it REALLY did smooth out the idle.
 

Rocket Man

Mark
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If you take a normal 5/8” spark plug socket, you’ll see the end can accommodate a regular socket. This combination is the exact right length.
 
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