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Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

Spark plug gap?

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Old 08-08-2008, 12:47 PM   #1
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Default Spark plug gap?

Hey guys, i have to reset the valves on my 383 so i am going to remove the plugs to make the thing easier to turn over by hand. While i have them out i planned on re-gapping them. Its a 383, 10.5 - 11:1 compression, 14* initial and 38* overall timing, trick flow heads, mallory unilite distributor and mallory coil, msd 6A ignition. Im using NGK FR5 plugs. I was thinking of gapping them around .038 - .040. What do you guys think?

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Old 08-08-2008, 03:07 PM   #2
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I've always ran .045-.50 on mine. MSD Dist, 6AL, Blaster 3 coil, My lit with the 6AL box stated .045 min. Theory goes that with the hotter spark and holding it longer due to the MSD box you don't need a tight plug gap. FWIW
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Old 08-08-2008, 03:07 PM
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6a, bigblock, blaster, coil, distributor, gap, gaps, ignition, ly5, mallory, plug, sbc, spark, sparkplug, unilite


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