Re: Melting plugs on my liightning
That sounds serious and I would be finding out what boost it is running. Stick with NGK's but could try dropping to a cooler range of plugs.
I think you should get the air/fuel ratio checked because if it's running lean on boost and detonating then it will lead to more serious problems.
If you don't get it checked out then my advice is don't push it too hard until you have it checked.
71 429SCJ Mustang