View Full Version : Spark plug gap?

08-08-2008, 01:47 PM
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?


08-08-2008, 04:07 PM
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