spark plug gap - 460 Ford Forum
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post #1 of 13 (permalink) Old 10-11-2008, 02:07 PM Thread Starter
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spark plug gap

what do u guys like ? ive got a msd-10 plus with plus coil taylor 10.8 mm wires

thanks guys
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post #2 of 13 (permalink) Old 10-11-2008, 03:13 PM
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Plug gap

My A-Headed 605 works fine with .045 plug gaps.
I use the same gap (and Accel #762 plugs) in my Blue Thunder 514.
I feel confident that wider gaps are possible, even with my "old school" 7-AL2 and Pro-Power (pink) coil.
I just seem to be stuck on .045
It works for me.

Keith
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post #3 of 13 (permalink) Old 10-11-2008, 07:00 PM
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I run the same .045 gap as Keith..

Chris

VPRC 1998 Mustang
557 CJ :1.15 60', 5.32@129.58 mph @ 2600lbs
665 C&C Hemi : To Be Determined
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post #4 of 13 (permalink) Old 10-11-2008, 10:58 PM
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Re: spark plug gap

Quote:
Originally Posted by ONEBAD555NOTCH
what do u guys like ? ive got a msd-10 plus with plus coil taylor 10.8 mm wires

thanks guys
What's the spark plug ?

B F Evans Race Parts
270-278-2376
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post #5 of 13 (permalink) Old 10-11-2008, 11:11 PM
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I've always used a .035 with the AR3911's, I got in a hurry this weekend and threw um in without gapping and it ran fine, i think they are like .025 out of the box.

69 Grande'
P51 headed 563
3070#'s
5.15 @ 134.89
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post #6 of 13 (permalink) Old 10-12-2008, 03:56 AM
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Opened mine up to 40 here - and it showed up the crack in my rotor arm I had forgotten about

A long way from anywhere

'70 429
Isky 270 cam
Roller-rockers etc
Torker & 780 Holley
Headers
Petronics and Mallory ignition.
Shift-kitted C6
2.75 4-spider 9"
All in '55 F100
Top speed: 131mph
Best e.t.: 13.93
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post #7 of 13 (permalink) Old 10-12-2008, 06:38 AM
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I run mine at .040 with an MSD 6 series.

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1970 Cougar Eliminator
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10.42 ET 133mph
All Motor@3750LBS
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post #8 of 13 (permalink) Old 10-12-2008, 09:33 AM
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the side gapped plugs like the AR-3934/3933/etc do not require the wide gaps .

B F Evans Race Parts
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post #9 of 13 (permalink) Old 10-12-2008, 12:28 PM
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Quote:
Originally Posted by Lem Evans
the side gapped plugs like the AR-3934/3933/etc do not require the wide gaps .
So what would I run this plug at? I'm going to start with the AR-3933 per David Cole's recommendation with my Alky setup & BT heads. I have a 7AL-3 by the way.

John.

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post #10 of 13 (permalink) Old 10-12-2008, 04:48 PM
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i always thought .035 (seemed to work anyways)
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post #11 of 13 (permalink) Old 10-12-2008, 06:08 PM
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plugs

All the AR autolites come set at .025 , with the side gap it is not required to run anything over .035 IMO, check them with a wire gauge.
Rich
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post #12 of 13 (permalink) Old 10-12-2008, 06:49 PM
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our dyno shows a loss of HP over 40. on conventional plugs

70' Maverick , 557 A-Head 8.90's...1969 #MATCHING MACH1 428 CJ RESTORED 1 of 1....1970 HEMI CHALLANGER
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post #13 of 13 (permalink) Old 10-12-2008, 06:59 PM
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not to butt in but but what plugs do you guys run in your c- headed motors? thanks eric
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