spark plug thread size
July 12th, 2008, 09:21 AM
#1
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Location: Indiana
Posts: 28
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
July 12th, 2008, 04:31 PM
#2
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Join Date: Jun 2008
Location: So. Central Texas
Posts: 360
Your plug thread size is 18mm, the only thing metric on American built cars of the time.
July 13th, 2008, 05:00 AM
#3
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Location: Southern CA
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