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Afr heads, spark plug advice

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Old Jun 1, 2009 | 08:17 PM
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Default Afr heads, spark plug advice
hello, i have a 350 10.6-1comp. with Afr195 elim heads what plugs do u guys run? what gap with a GM HEI distributer? thanks
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Old Jun 1, 2009 | 11:12 PM
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I use the Autolite Platinums # AP3924 with a .050 gap.
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Old Jun 2, 2009 | 03:50 AM
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same 63mako's spark plugs on my L88 10:1 cr engine, but copper core and 0.04 gap.

the best spark plug till now.
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Old Jun 2, 2009 | 03:59 PM
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ok, i was running a champion rc9yc that is what my engine builder broke in and dynoed it with. made 453 hp. but the plugs fouled in like 80 miles. what do you make of this. they only did basic dyno runs to set timing make sure everything was ok, i think 5 pulls. i have cruised it on the street but have not been to strip yet and wont go till i put some fresh plugs.opinions?
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Old Jun 3, 2009 | 08:04 PM
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Originally Posted by steve dalla
ok, i was running a champion rc9yc that is what my engine builder broke in and dynoed it with. made 453 hp. but the plugs fouled in like 80 miles. what do you make of this. they only did basic dyno runs to set timing make sure everything was ok, i think 5 pulls. i have cruised it on the street but have not been to strip yet and wont go till i put some fresh plugs.opinions?
Similar experience here. RC9YC's are too cold for your application. 63mako's autolites are the proper heat range. If you prefer AC Delco, the equivalent is #41-629, or FR3LS. If you like Champions, try RC10YC4.
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Old Jun 3, 2009 | 08:23 PM
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AC Delco FR3LS with my AFR 195s. Never fouled on me.
Bee Jay
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Old Jun 3, 2009 | 09:35 PM
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One reason I used the Autolite is they are noticably shorter and the proper heat range. Way easier R&R and better clearance on the headers.
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Old Jun 3, 2009 | 10:00 PM
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thanks guys!! 63mako that is just what the doctor ordered. u have solved a couple problems for me over past few years and i cant thank u enough
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Old Jun 3, 2009 | 10:03 PM
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oh yeah forgot to ask do autolite platinums come pre gapped? i heard somewhere you are not supposed to gap those because of platinum tip? sorry for the dumb question.
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Old Jun 3, 2009 | 10:11 PM
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Originally Posted by steve dalla
oh yeah forgot to ask do autolite platinums come pre gapped? i heard somewhere you are not supposed to gap those because of platinum tip? sorry for the dumb question.
Yes. They are pregapped @ .044. That will be fine for your HEI. I always check them though.
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Old Jun 3, 2009 | 10:38 PM
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Originally Posted by 63mako
One reason I used the Autolite is they are noticably shorter and the proper heat range. Way easier R&R and better clearance on the headers.
Thanks. That's good to know.
Bee Jay
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Old Jun 4, 2009 | 03:06 AM
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Originally Posted by 63mako
I use the Autolite Platinums # AP3924 with a .050 gap.
63mako , which improvement in using the platinum type instead of the copper? i use the copper 3924
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Old Jun 4, 2009 | 04:58 PM
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Originally Posted by elle88
63mako , which improvement in using the platinum type instead of the copper? i use the copper 3924
You run a wider gap with the platinums. Works well with an HEI or in my case an MSD. It is the best conductor and they last over twice as long as a conventional plug. Here is a link comparing ther two.
http://www.se-r.net/engine/platinum_copper_ngk.html
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Old Jun 5, 2009 | 11:11 AM
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Originally Posted by 63mako
I use the Autolite Platinums # AP3924 with a .050 gap.
Same only with the .045" gap
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