spark plug thread size
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Registered User
Joined: Apr 2008
Posts: 28
From: Indiana
spark plug thread size
I want to run a compression check on my'63 394 hi comp..Most of the newer guages have metric threads.. Anyone know what size threads my spark plugs have so that I can convert my compression guage ?? thanks
Geezer
Joined: Jun 2008
Posts: 360
From: So. Central Texas
Your plug thread size is 18mm, the only thing metric on American built cars of the time.
Junior Member
Joined: Oct 2004
Posts: 2,212
From: Southern CA
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