What is the production cast number after the 340 on the block? The higher the number the more chance of the cylinder being off set. Usually 340-1's are the best and there seems to be little problems with blocks up to 340 -8. Here is a example of a Race X block they were all casted as 318's this one was terrible 318-11. So bad the one lifter bore was missing a piece when casted. so the had to be welded and bushed
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