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Thanks for advice everyone, ended up taking it to a recommended mechanic who said head didnt always need skimming, depended on any warping due to head cooling at different temps. Anyway, it needed a skim (4 thou") but the engineering firm that does all his work (the blokes an ex main agent mech. who now works from home) put it on a test bed, checked it, skimmed it and rechecked it then calculated what thickness head gasket it would need to keep the compression ratio the same and supplied one (they come in various guages apparently). It runs like a dream.
Help people! My sons girlfriend brought her V reg Fiesta Zetec to me 'cos the heater was constantly cold, and I found emulsified oil in the cooling system. It looks like a head gasket problem, but I've never come across the oil getting into the water, its usually water that gets into the engine. Also a mechanic has told us that the head will definately need skimming because it will be warped. Is this all true?