M8 more logical just often harder to find drill bits to match unless you get a kit. Actually based on M8 basically identical in size best to not introduce a weird Jon metric bolt.
Great tips above. The main point of using the smaller drill first through the water pump is to use that as a perfect guide of normal.
If old pump is aluminum perfect to practice.
When tapping critical and soft material, use a method like 1/2 turn clock wise 1/4 turn CCW and repeat. (1/4, 1/8 if the tap binds).
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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