Any ideas what sort of costs I'm looking at if it is a exhaust valve??? got told might of melted a piston, but the strange thing is I have no smoke at all when running, I have seen a piston off before and you could tell as lt was smoking it's tits off, even coming through the air vents, but this time the car runs spot on, just no2 down.

So what you guys recon?? Good and worst scenarios please

@ Steve how many ham buttys would have to be consumed to watch the job from start to finish, and how many sausage rolls per rounds of bread???