I removed the Original 049 Heads, and had them rebuilt, ang when I was cleaning the block head bolt holes, I noticed the Tap on one hole stopped about 5 thread turns like it bottomed out after looking I took a pic this is what I found. Should I drill it out and retap . It never leaked or lost water. If I need to drill it what size drill and where will the shavings end up.Thanks for help Also I looked at the bolts I removed which were ARP none were broken..
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