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I'll look into the conical brass nuts. Ebay also has several different kinds in that category.

I got the broken bolt drilled out. Fortunately I was on target with the center punch. When I got finished with the drilling, the remaining old bolt threads unscrewed with needle nose pliers. All I had to do is dress the original threads with a tap. I'm happy that job is done. Next is to set the valve lifter clearances. Then start reassembly. I'm still undecided with single exhaust muffler choices. Leaning toward a long glass pack.

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I got the manifold and engine surface cleaned up and ready for re-assembly. I removed the valve covers and was surprised to find the inside free of sludge. Just clean oil laying in the low areas. Valve springs look good. Next, check and set valve clearances before putting it all back together. The shop book gives two sets of clearance numbers, one for hot and one for cold.

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35 minutes ago, Dennis Detweiler said:

I got the manifold and engine surface cleaned up and ready for re-assembly. I removed the valve covers and was surprised to find the inside free of sludge. Just clean oil laying in the low areas. Valve springs look good. Next, check and set valve clearances before putting it all back together. The shop book gives two sets of clearance numbers, one for hot and one for cold.

 

Congratulations...you have jumped one of the most dreaded hurdles we have when it comes to refreshing our flatties.  😄

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