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Ok my block has casting C9OE, so it is a standard 302 block cast in 1969. Now my question is when I go to buy parts for it do I look under year 1970, or 1969?

For example my engine takes the water pump with inlet on the drivers side and summit lists that as 70 and above 302 engines. Also my harmonic balancer is a 4 bolt, not the 3 bolt, and those are listed as a 70 and above, where as 69 is a 3 bolt.

Thanks for your help, this has been on my mind for a little while and want to finally understand it!!
 

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It's very common for casting numbers (part numbers) to pre-date the cars build date. In fact it's very common for all part numbers to predate the build date.

I would just stick to the model year when ordering parts. If a part has been superceeded they'll usually catch it.
 

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The C90E is just a revision number and not the casting date. The casting date should be in the format of ie 9B23.
You could still have a 1970 block.
 
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