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Old 07-19-2021, 02:39 PM   #3
Hot Rod Reverend
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Join Date: May 2010
Location: Lancaster, CA
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Default Re: Early Y Block OHC 239 Spark Plugs

The EBU 239 had 14 mm - the EBV 239 (most of these ended up in trucks in 55) had 18mm.

Of course, over the years people have changed out heads, blocks, and the whole gamut. I have disassembled several Y blocks that had mismatched heads.
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