It did break ,but didn't "let go". Best we can tell the porcelain was damaged during plug gaping. It broke loose and was rattling around on the center electrode. With no path to disperse the heat it became a glow plug and nipped the #1 piston near the valve notch. The tune up wasn't that radical. On a VERY mild tune it'll run 9.90@133 forever, been doing that with no wounds. On inspect during tear down #3 rod bearing showed signs of detonation but the other 7 looked good. Remember this is still stock cast crank, stock 360 block, stock truck exhaust manifolds, no intercooler at nearly 3800lbs. Street radials, steel wheels, full stock interior. 2014 Monster Mopar ran 10.0 shoot out and Pro. Made it to the final 4 in the shootout and the final 6 in Pro before a trans leak sidelined it. Plenty of 9 second passes, plenty of street miles, heck Dizusters mom has taken it to Church.
Doug