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70rs/ss · 10-31-2008, 03:55 PM

The casting number at the back of the block is not 100% as GM reused a lot of the casting #'s too such as the famed 0010 block as it can be a 4-bolt 350 or a 327 or a 400, but only during certain years, which is why the casting date, pinpoints when the block was cast and therefore if the suffix or casting number offers 3-4 options, but only one during that year, the casting date then makes it a 100% for sure deal.

10-31-2008, 03:55 PM	#7
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,270	Re: Help me decode my engine The casting number at the back of the block is not 100% as GM reused a lot of the casting #'s too such as the famed 0010 block as it can be a 4-bolt 350 or a 327 or a 400, but only during certain years, which is why the casting date, pinpoints when the block was cast and therefore if the suffix or casting number offers 3-4 options, but only one during that year, the casting date then makes it a 100% for sure deal.