Me n uncle went out after work to tune our deals to run alil cleaner.last time out my turbo 5.3 was alil fat on secondaries and high boost so i wanted to clean it up, jetted down couple sizes made a nice hard pass watchn afr. and i had taking away alil too much and was seeing 11.7-11.8 at 19lbs so i turn on my 3rd water meth nozzle to fatten it up alil.line up for pass ,hit it hard n sure nuff afr is where i want it but at the end of pass while still in alot of boost i hear n feel a cylinder go down, let out as fast as safely possible and it goes to missing. thot oh shit done took a ringland off a piston, i go out n start unplugging coils till i found the miss at #2. Hobbled it back to the ramp with a sad face long drive back from the lake even tho its only 8miles.back boat into my shop and start pullin even bank plugs prepared for the worse.dont see shit wrong ,bank still has 150psi on each so i pick up 1 plug at a time and check em with my lil magnifier flashlite and nada till i get to #2. See a crack in porcelin , turn the plug so its pointed down and hear a clink, damn porcelin cracked and slid down closing the gap lol went from a shit afternoon to a good day.guessn the added water meth either hit the plug unatomized n cracked the insulator nuff to let it slide down. jus knew id proved the ls naysayers right lol scared me thinkn i was gna be changing a piston in.mine this wknd but got lucky.
so i gta back the watermeth down i think if its hitn a hot plug that way.any other causes for a insulator to slide down like that i dont know of? Im thinkn bad plug since they look awesome otherwise.champion stock 5.3 plugs for truck engines.heat range is lookn perfect on em.no chance of ever seeing a fuel ring, the watermeth steam cleans that away.champion plug jus shit? always run delco ngk or champion and have never had issue till tday.