I just started putting plug wires on my 440 and noticed #5 and 6 both are really tight to my Hedman headers, like touching. I'm using 7 mm NKG Blue high temp silicone 250* Celsius + Not sure what that is in Fahrenheit, but I suspect it is less than those headers will get. They are angled plug wires. I'm using those fiberglass socks as well but they wouldn't fit on #5 and 6 either. I kind doubt they would help anyways. I'm looking for any suggestions. I was thinking maybe a straight plug connection. Last choice I guess is a BFH