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Hi. I have a 450 petrol (700cc) which started making some rattling noise on start-up. The noise came from the timing chain so I had it replaced at a local shop. I picked up the car yesterday and noticed I hear noise coming from the chain when the car is under load. The mechanic also advised me to change the valve guide seals as the car leaves a smudge of carbon on when starting, in the morning. He said he could do the whole thing without removing the head. I'm not very mechanically inclined so apologies if I make a stupid question, but could the engine timing be off? If so, would an oscilloscope test suffice to diagnose it? Is it really possible to change the timing chain and assure the timing is good without removing the head? What other questions would you ask the mechanic if you were in my shoes? Thanks in advance for any help you can provide.