With a dialed in carb and tune, I would think 15K+ miles is possible with an HEI. Multiple Spark Discharge may reduce plug life?
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk
Last edited by Blued and Painted; 02-16-2017 at 12:02 PM.
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