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Just to put a cap on this debate, with a five chain motor, it is possible to swap the IMS without locking the cams. That said, in doing so, you still run a level of risk of the M96 jumping time. While they don't always jump time, they still can, and sometimes do. The reason shops lock the cams is that we are not in the business of assuming risk; locking the cams assures there will be no problems, period.
It's your car. If you want to accept the risk, then don't lock the cams. In most cases, you will probably be fine; but if it goes wrong, you are going to be in for some very expensive fun.......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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