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Discussion Starter · #1 ·
I recently got my head back from the machine shop. They installed over sized valves port and polish the head and everything else you can dream about. Yesterday I was measuring my buckets buckets shims and cam clearance when I noticed this. It look like a whole in the exhaust port of what I believe is #1 cylinder. Can anyone give me some insight on this.
 

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I don’t recall noticing a hole on any of my cylinder heads before. I cannot image a good reason for a hole being here. What is on the back side of that hole?
 
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