I wonder what "bank 4/6" means. There are bank 1 and bank 2 (and no more) and cylinders 1 to 6. The fault can also be caused by completely worn rails. In any case, as already described, immediate action is necessary, the engine can remain installed, you have to create some space. This video shows an overview very nicely with a 5 chain engine that gives you an idew how much time is needed to perform the work and what spare parts are used to calculate the costs.
https://www.youtube.com/watch?v=ocntYwozZBY&ab_channel=PorscheClubofAmerica
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