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Old 07-19-2021, 01:02 PM   #1
motorman8467
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Default Early Y Block OHC 239 Spark Plugs

Did the early 239 Y Block have 18mm spark plugs, or, 14mm? Heard it both ways. I argue this once a week. Please, someone put this to bed. Thanks.

James
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Old 07-19-2021, 02:36 PM   #2
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Default Re: Early Y Block OHC 239 Spark Plugs

14mm. 1955 was the first year for the tapered seat 18mm. (If I'm remembering correctly)
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Old 07-19-2021, 02:39 PM   #3
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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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Old 07-19-2021, 03:30 PM   #4
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Default Re: Early Y Block OHC 239 Spark Plugs

Thanks, for confirming. I thought I was right, but, have couple of buddies, who didn"t believe me, so, I wanted to hear someone else say it. Thanks for your time.

James
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Old 07-19-2021, 03:37 PM   #5
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Default Re: Early Y Block OHC 239 Spark Plugs

Thanks, for confirming. I thought I was right, but I have a couple of buddies who didn't believe me, so, I wanted to hear someone else say it.
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Old 07-19-2021, 07:31 PM   #6
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Default Re: Early Y Block OHC 239 Spark Plugs

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My spare plugs out in the garage for my '54 EBU are Champion 844 H10C. Don't have the part # memorized, I just ask for plugs for my application. To verify what you've already been told, online specs and my measurements say 14mm thread diameter.





https://www.sparkplugs.com/champion-...kel-spark-plug
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Old 07-19-2021, 09:27 PM   #7
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Default Re: Early Y Block OHC 239 Spark Plugs

For whatever it's worth,
the '54 EBY / 256 engine I had used the metal gasket 14mm spark plugs also.



.

Last edited by dmsfrr; 07-19-2021 at 10:23 PM.
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Old 07-20-2021, 04:44 AM   #8
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Default Re: Early Y Block OHC 239 Spark Plugs

i remember seeing a 55 ford 292 with big plugs on one side and small ones on the other.ran nice.
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Old 07-20-2021, 06:05 PM   #9
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Thumbs up Re: Early Y Block OHC 239 Spark Plugs

Quote:
Originally Posted by 40 Deluxe View Post

14mm. 1955 was the first year for the tapered seat 18mm. (If I'm remembering correctly)
You did (are) ...

Quote:
A CHAMPION (860), 18MM , TURBO-ACTION plug is incorporated in the 1955 truck engine.
- 1954-55 FORD TRUCK SHOP MANUAL
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Old 07-20-2021, 08:06 PM   #10
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Default Re: Early Y Block OHC 239 Spark Plugs

"TURBO-ACTION"?

OK... Was Champion pulling our leg?
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Old 07-21-2021, 08:55 AM   #11
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Post Re: Early Y Block OHC 239 Spark Plugs

FORD used CHAMPION from 1955 until they bought certain parts of AUTOLITE (but they won't), wanting mostly the SPARK PLUG DIVISION.

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