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Richard E.

I am rounding 3rd on my resto of my '50C6 sedan, the "Queen of the Road," or "Queenie" as she is known in our chapter and I have a question re: spark plugs? I had Champion RH10C plugs on it when I tore it down. I have six brand new Champion J8C plugs on my shelf, are these a correct replacement plug? The engine is a 262 cu in narrow block that has been completely rebuilt and is running a two barrel carb.

I will post pictures later. Muchos gracias!

46HudsonPU

If the RH10C is the correct plug (?), the following are equivalent -

NGK: B4L
Accel: 166
AC Delco: 46F,C43L
Autolite: 225
Bosch: WR8EC
Champion: RH10C
Denso: W14L
Mighty: M4E4
Motorcraft: AS4C
Napa: X526
Prestolite: 14L9
Splitfire: SM021F

Here's an online conversion for equivalent spark plugs from different manufacturers -

Spark Plug Converter

Geoff C., N.Z.

The J8C's will work, but you will have to stick with them from now on, as the thread is slightly shorter, so the remaining thread in the head will coke up, and you won't be able to get the original H10's to screw right home. The J8C is used widely in lawn mowers and similar small engines, "C" stands for copper core. They are slightly cooler running than H10.

1951hornethardtop

I have always used Champion plugs in my Hudsons. What are you using for the H-11 in the Hornets now that they are unavailable????

Uncle Josh

Auto Lite 216 at $1.19 or Bosch 7915 at $1.42 plus 2 day shipping at Rockauto.

Richard E.

Thank you!

ClassicCar

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