Thread: 427 or 428 - How do I tell?
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Old 12-03-2010, 08:08 PM
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Bernica Bernica is offline
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The casting numbers on the side of the block will help a lot. Should be something like "C5AE-X" where X is going to be a letter (or letters) of some sort. If you find them and post, there are lots of folks here with books that may be able to help.
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