Spark Plug gap and torque 239 - Ford Truck Enthusiasts Forums



Spark Plug gap and torque 239

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Old 01-18-2007, 01:37 PM
galaxie641 galaxie641 is offline
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Spark Plug gap and torque 239

As the title says what are the gap settings and the torque on the plugs for my '51 Flat8?

I pulled one plug and it was not very tight.
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Old 01-18-2007, 06:20 PM
kotzy kotzy is offline
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Per 49/50 truck manual old H10 plugs were .025 to 028. Plugs were tightened to a torque reading as follows with a new gasket, 24-30 ft. lbs.
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Old 01-18-2007, 06:55 PM
galaxie641 galaxie641 is offline
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More torque than I would have figured thank you.
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Old 01-20-2007, 10:55 AM
dffay dffay is offline
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Could that be INCH pounds?
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Old 01-20-2007, 11:00 AM
dffay dffay is offline
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Bishop's book cites 24-28 foot lbs in cast iron heads. If you have aluminum heads it would be less. Both should get some anti-seize lube on the threads.
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Old 01-20-2007, 02:42 PM
kotzy kotzy is offline
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My info comes from a Ford service manual by Ford dated May 1 1950. You have to remember you are crushing a copper and asbestos gasket which had a direct influence on the heat transfer from the sparkplug shell to to the head. That is what people don't think about even today with the tapered seat plugs, if they are not tight enough the plug becomes a hotter plug then someone thought they installed. I don't know what they have substitued for the asbestos today,
I'm sure someone jumped on the plug makers to get it out of there.
Kotzy
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Old 01-20-2007, 04:13 PM
galaxie641 galaxie641 is offline
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I was surprised, the plugs in it seemed really loose. The plug box said something about tightening to either a 1/4 or 1/2 turn. Anyway got the new ones in and the engine runs even better now that it has new plugs and the original wires, yes I said original, are gone. All but 1 plug were still within spec, one was under .020, probably close to .010 rest were around 025.
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1950, 239, flathead, ford, gap, onford, plug, point, settings, spark, truck, v6, v8

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