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On 16 Aug 2001, at 11:48, Dave Campen wrote: > The way I've always understood it, one cause of head cracking is not > allowing the engine to warm up gently. If you drive the car hard when cold, > not only is there the drastic piston/cylinder wear that Leon mentioned, but > there is a huge temperature differential between the hot combustion gasses > and the cold head. This sounds reasonable to me. There is also the fact that the valve seats are an interference fit in the head, and the stress on this fit is highest when the parts are cold. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe