bloc
SILVER Star
That was my thought too.. but I don’t have an answer for why the old plug would work. I would be planning to take it apart and get to the bottom of it though.It makes me feel that probably the coil's rubber end was having trouble going around the plug...
And I’d invest the small amount of money on a torque wrench. Spark plug torque is typically lower than it would seem it should be.. and as we all know damage to the head is very high-consequence.