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Old 09-03-2010, 07:45 PM
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Spark plug recommendation needed

Hello,
I want to make sure I'm using the proper plug for my setup.
Chevrolet 355 ci small block
Dart Pro 1 alum. heads (72cc)
Domed, forged pistons 10:1
carbureted (and it tends on the rich side)
Ignition is pretty hot, Crane "Fire Ball" capacitive discharge
Prior owner installed AC Delco 41-602 plugs, not shure how much thought went into that, or if they are even the right plugs.
Looking for a premium plug that would do well in a sometimes overly rich environment. Also could use a gap recommendation. Wouldn't mind trying something new, like the Bosch "surface air gap technology" plugs (yeah the ads in "Hot Rod" are having the intended effect). Naturally, the auto parts counter help, can't. So I fall back on the best help of all, you guys.
Thanks very much!!

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Old 09-04-2010, 09:58 PM
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From the Dart website: "Gasketed, .750" reach, Autolite AR3934"

If you want to try sometig different I would suggest you visit the spark plug manufacturer of yur choice and crossreference the Autolite plug listed above.

Beagle
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Old 09-04-2010, 11:38 PM
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Champion RC-12YC. .035" gap . Instead of getting sucked into the super spark plug scam Why not fix the carb? When, Why, How does it run rich?

Last edited by F-BIRD'88; 09-04-2010 at 11:50 PM.
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