TWO QUESTIONS= number two piston has melted in the middle also i can see the top ring half way around the bore been told the oil on k&n cone filters mess up the reading on the airflow meter which causes this to happen on number two pot is this true?????, the engine has only done 1200 miles since a full rebuild the other three pistons are like new (wisecos ) ive had the heads skimmed which is the best head gaskets to use the ones on there are metal triple gaskets 1.5mm ive been really lucky its hardly scored the bore at all i just bought the car as the previous owner had spent £3600 on the engine and had enough!!!!!