The Ford Barn

glenn in camino · 08-19-2017, 07:21 PM

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.

RonC · 08-19-2017, 10:09 PM

I tight 0.020.

Big hammer · 08-20-2017, 12:56 AM

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

Patrick L. · 08-20-2017, 06:47 AM

Point gap shouldn't change because of compression ratio. Spark plug gap may have to be reduced depending on coil being used.

Bob Bidonde · 08-20-2017, 07:21 AM

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.

BILL WILLIAMSON · 08-20-2017, 04:42 PM

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08-19-2017, 07:21 PM	#1
glenn in camino Senior Member Join Date: May 2010 Location: Camino, CA. Posts: 3,086	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.

08-19-2017, 10:09 PM	#2
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: 5.9 head points adjustment I tight 0.020.

08-20-2017, 12:56 AM	#3
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,430	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 __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done

08-20-2017, 06:47 AM	#4
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	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.

08-20-2017, 07:21 AM	#5
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 4,113	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. __________________ Bob Bidonde

08-20-2017, 04:42 PM	#6
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: 5.9 head points adjustment Sponsored Links (Register now to hide all advertisements) When one runs GOOD, just leave it ALONE! Bill Practical __________________ "THE ASSISTANT GURU OF STUFF"