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Blue Thunder Head ?

1075 Views 2 Replies 3 Participants Last post by  DaveMcLain
What spark plugs are used in the GM exhaust flange heads ?

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I used to own a set. Ran Autolite Racing AR3933
3/4 reach gasketed with a 5/8 hex. Something similar to an Autolite 3924 dimensionally will work.
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