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The exhaust valve seats are very hard and I cannot do anything with them using my tools, so "off with the head" to have the exhausts done
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Hi Rod
I'm a little confused with this. As far as I can recall, the standard 216 was not fitted wirh hardened exhaust seats or inserts but maybe my memory is failing again.
Sounds like you are taking the head to a engine machinist to have hard inserts fitted.
Looking at the block surface, it has some corrosion around the coolant ports . There is a chance that some coolant will leak. It might be worthwhile to have the block surface machined , any engine rebuilder can do the job for you.
The stovebolt forum is a good place for vintage Chevrolet owners.Have a look at the 'Tech Tips' page
https://www.stovebolt.com/ubbthreads.../forum_summary