The Ford Barn

Pat Martone · 08-16-2012, 06:07 AM

I understand that timing advance should never go more than 28 degrees with running a 5.5 high-compression (HC) head, but I also recall reading somewhere that the points and plugs gaps should be changed from the stock settings.
Could someone please tell me the correct points gap and spark gap when using a HC head?
Thank you.

Tom Wesenberg · 08-16-2012, 07:23 AM

No need to change the points gap, as that should be .020" regardless of compression ratio. More compression takes more volts to fire the plugs, but 5.5 is still a low compression engine and .030 or .035 for plugs should work fine.

HoarseWhisperer · 08-16-2012, 07:33 AM

3x Spark Plug Gap
.035" (A6050A cylinder head)
.030" (B6050 cylinder head)
.025" (A6050B cylinder head)

columbiA · 08-16-2012, 06:47 PM

Sponsored Links (Register now to hide all advertisements)

On my 33 "B"engine with 5.9 Brumfield head,I use Champ C16C plugs@ .035" gap & points @ .020"& runs perfect.

08-16-2012, 06:07 AM	#1
Pat Martone Senior Member Join Date: Jul 2011 Posts: 495	Does a HC head require different points and plugs gaps? I understand that timing advance should never go more than 28 degrees with running a 5.5 high-compression (HC) head, but I also recall reading somewhere that the points and plugs gaps should be changed from the stock settings. Could someone please tell me the correct points gap and spark gap when using a HC head? Thank you.

08-16-2012, 07:23 AM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Does a HC head require different points and plugs gaps? No need to change the points gap, as that should be .020" regardless of compression ratio. More compression takes more volts to fire the plugs, but 5.5 is still a low compression engine and .030 or .035 for plugs should work fine.

08-16-2012, 07:33 AM	#3
HoarseWhisperer Senior Member Join Date: May 2010 Location: Ontario, Canada Posts: 1,470	Re: Does a HC head require different points and plugs gaps? 3x Spark Plug Gap .035" (A6050A cylinder head) .030" (B6050 cylinder head) .025" (A6050B cylinder head) __________________ I know a lot of things; I just can't remember them all. 1928 CCPU 82-A 1931 Roadster 40-B Dlx (Canadian)

08-16-2012, 06:47 PM	#4
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: Does a HC head require different points and plugs gaps? Sponsored Links (Register now to hide all advertisements) On my 33 "B"engine with 5.9 Brumfield head,I use Champ C16C plugs@ .035" gap & points @ .020"& runs perfect.