Chinese look a like Little-M block
I got these blocks about 6 months ago. They are circle track 434ci engines. The first one has about 1000 laps or so on it and is running great. The second we build as a backup, and simply haven't had to use it. We had the pan off at about 800 laps, everything looked great. We change the oil and cut the filter every week. We simply haven't had any problems. Sounds like somebody doesn't like the new kid on the block.