Hi iv got a 07 cupra with only 70k on it full service history its running 365bhp with mods to support that and the engine is scrap something metal has got into cylinder 1 and took a small chuck out of the side of piston left deep marks on the blocks bore and damaged the head the bore is unrepairable so need new engine but I want to find out what's gone wrong so I can make sure I don't damage new engine the spark plugs was fine and iv check the hpfp cam follower and that's fine so where else can I look all help is much appreciated also can I replace it with a bhz engine