Long story short, got a missfire, white smoking bad and seems to be flooding cyl 2 especially, thought it was fuel at 1St but took radiator cap off and it's throwing water all over in radiator and used loads, Definatly not plugs leads b dizzy etc and leaking water and got a air lock as it's just started doing it randomly and I've changed all rest, only thing it can be is head gasket, Just wanted to make sure 100% that it's gasket by trying the oe one, and then if it's still doing it I can buy other things along with a steel gasket, how thick are standard ones to make much difference with it been 1.4 mm?