Very common problem on that early engine. MB does offer 2 repair sizes of valve guide & I have installed 100's of them through the years.

Have even seen people install 1 guide on the engine as a temporary repair.

The standard guide is a couple ten-thousands larger than the ones in the engine from the factory. OF course a good machine shop can turn down one of the repair sizes to the correct size for the diameter of the OD bore of the guide.

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