TR6

[ad573@osfn.rhilinet.gov (John H. Howard)]

A question for those many of you much more knowledgable than I.
In removing my 73 TR6 head for valve work, I discovered a crescent
shaped opening,about 1 inch long, in the block casting at about
ten o'clock location to the timing chain cover. It is covered
but not sealed by the water pump housing. The opening shows
on some catalogue drawings but not others.
What's the purpose of this? Cooling? Anyone know?
John

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