Forced Induction Superchargers | Turbochargers | Intercoolers

Spark Plug Gap?

Old Feb 9, 2008 | 01:19 PM
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Default Spark Plug Gap?

I am running a 408 with a F1R procharger with 20lbs of boost, 116 octane fuel, autolite ar123 plugs, what should I set the gap on the plugs.
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Old Feb 9, 2008 | 02:03 PM
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Originally Posted by SLID
I am running a 408 with a F1R procharger with 20lbs of boost, 116 octane fuel, autolite ar123 plugs, what should I set the gap on the plugs.

Anything at or below .032 and you should be fine.
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Old Feb 9, 2008 | 02:51 PM
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Old Feb 9, 2008 | 10:59 PM
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dont be afraid to tighten them up to .025,you wont lose any power by making them tighter,i run mine at .016
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Old Feb 10, 2008 | 12:49 AM
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Originally Posted by Shawn @ VA Speed
dont be afraid to tighten them up to .025,you wont lose any power by making them tighter,i run mine at .016
Even at the 35#'s of boost in your sig, did you really need to tighten the gap THAT much to keep from blowing out spark?
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Old Feb 10, 2008 | 03:31 AM
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I ain't going to tell him he's wrong looking at his sig, lol, but half the gap of the norm seems extreme but what do I know I was going to run mine at .032 unless someone tells me otherwise.
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Old Feb 10, 2008 | 11:05 AM
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I run tr-6s and I have mine at .030.....good luck.....
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Old Feb 10, 2008 | 01:38 PM
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Originally Posted by gametech
Even at the 35#'s of boost in your sig, did you really need to tighten the gap THAT much to keep from blowing out spark?
So you know exactly whats in my engine-dont know how you can tell me that i dont need that gap when you dont know what i have,i run way more than 35 psi at the track-thats just what i run it to on the dyno+i have a bunch of compression
all i was saying is the tighter gap wont hurt
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Old Feb 10, 2008 | 02:19 PM
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Is there a point at which the gap is too small?
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Old Feb 10, 2008 | 05:20 PM
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I run "TR7"s at .025"
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Old Feb 10, 2008 | 09:06 PM
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Originally Posted by Shawn @ VA Speed
So you know exactly whats in my engine-dont know how you can tell me that i dont need that gap when you dont know what i have,i run way more than 35 psi at the track-thats just what i run it to on the dyno+i have a bunch of compression
all i was saying is the tighter gap wont hurt
I was asking a question out of curiosity, NOT making a statement about your engine combo. Don't be so defensive when no one is attacking. Sorry if my post sounded like something other than a legit question.
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Old Feb 10, 2008 | 09:21 PM
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sorry about that,i did misread what you wrote,i've been sick too-makes me bitchy-sorry again
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Old Feb 11, 2008 | 07:18 AM
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since were on plugs, i would like to get a starting plug for my setup-after 40 years of s/b's, b/b's i am in future shock with a gen 3-lol
i have a 6.0 lq4, 9.2 wiseco pistons, using the stock tweaked 317 heads, z06 cam, carb'ed blowthru with a disc, prob around 10 lbs boost, vette setup with 8 rib, in a 69 chevelle
i would like to run an autolite, just need a good starting heat range-the plugs look diff that earlier gen 1's, so i guess its like everything else there a whole new ballgame also-thanks
i know my combo leaves some power on the table, but once i am up and running, then i will make changes-trying to build the car and the engine kills a lot of time (and yes i have a lot of experience with blowthrus and carbs)
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Old Feb 11, 2008 | 09:05 AM
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we run .017 to .025 over 20 psi to make sure they light...
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