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Old 08-30-2005, 10:03 PM
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The 400 block castings were 509, 511 and 814. The 511 block is the best one to get but majority of them are 4 bolts which are a tad weaker in the main area. 509 2-bolt blocks are a tad stronger than the the 511 4-bolts due to the 4-bolt weakening the main cap area. 814 blocks is the weakest block. If you come across a 511 block with 2-bolt mains that is in good condition, you got yourself a gem.
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