Quote:
Originally Posted by Jim Brierley
All blocks are not the same! I have 2 diamond Model B blocks that differ quite a bit in the port area. One has very large intake valves and ports and they are just fine, the other has stock size valves and smoothed ports, not really enlarged. I ran the second one for quite a few years with no problems. I rebuilt it a few years ago and cleaned up the ports using only a sanding drum. When done I noticed a spot in the port, so I picked at it with an awl, and it went thru into water.
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Yes, ...this is one of the main reasons why I purchased a sonic tester just to be able to find thin spots on these engines. Imagine if you had finished all of the machine work on that engine only to then discover that thin area!!
