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Head surface markers?

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Anyone opinion. Are these dimples depth markers related to head cut maximum?

Or just related to the casting process.

post-4108-0-92581000-1449860150_thumb.jp

Looks to me like a drilled hole that's been plugged. Is that directly opposite the oil feed hole to the cam towers?

Early e88?

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Early e88?

 

No this is a E31.

My E88 has the same markers.

I sold the P90 and I don't recall what that looked like.

S
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