Quote:
Originally Posted by handejector
Two different eras.
They used to be a machined part.
Later, they became investment castings. You can see the mold seam on it.
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Good catch.
The "filed" one is done as part of a tuning job to relieve pressure that may hinder cylinder rotation slightly. Nothing wrong with that modification.
Other than that, I don't see anything wrong with the "filed" one. I'd just leave it be.