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Old 08-19-2017, 07:21 PM   #1
glenn in camino
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Default 5.9 head points adjustment

I have one of the new 5.9 heads on my model A. What should my points setting be? What about a 5.5 police head on my other car.
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Old 08-19-2017, 10:09 PM   #2
RonC
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Default Re: 5.9 head points adjustment

I tight 0.020.
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Old 08-20-2017, 12:56 AM   #3
Big hammer
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Default Re: 5.9 head points adjustment

Stock points gap .018 to .022, you may want to play with spark plug gaps, I think I'm down to .032 or .030. 6.0 head, larger valve's, touring cam. Have fun playing around with different settings :-) I changed out 3x plugs to w18 plugs
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Old 08-20-2017, 06:47 AM   #4
Patrick L.
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Default Re: 5.9 head points adjustment

Point gap shouldn't change because of compression ratio. Spark plug gap may have to be reduced depending on coil being used.
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Old 08-20-2017, 07:21 AM   #5
Bob Bidonde
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Default Re: 5.9 head points adjustment

I am running a 5.5:1 head, a 12V Bosch hi-voltage coil, Motorcraft TT10 plugs with an 0.027" gap. I iterated the plug gap and spark advance adjustments, to find by the seat of my pants the best engine performance.
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Old 08-20-2017, 04:42 PM   #6
BILL WILLIAMSON
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Default Re: 5.9 head points adjustment

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