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This is incomplete but please feel free to edit this if you have knowledge on this matter
Once you have recorded the clearances and the shim sizes you want to use the shimulator to calculate your new shims. Shimulator
There are two ways to perform this procedure and you'll need to decide which method is better for you. The two ways of doing this are with the engine removed and the engine still in the frame. I've outline the pros, cons below.
Removed Pros: easier to access valve cover, shims, timing and everyting else. You might also find additional issues that you might not be able to find otherwise
Removed Cons: adds additional time and requires more tools.
You must loosen the bolts evenly starting with the middle bolts. Only loosen a few revolutions at a time. If you don't do this the bridge will break!