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I have a 1969 Grande Mustang and 2 302 engines. I need to decode the serial numbers for both engines.
The first one I believe to be a Boss 302 with a serial number of GY664018. the second engine which is the enginge that came installed from the factory with the serial number 9R147374.
Can anyone help me with decoding these serial numbers. Thanks
 

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a boss 302 will have thread in freeze plugs, so if the freeze plugs dont thread into the block then its just a standard block. heres a copy and paste from some other forums talking about serial numbers on boss 302s:

Excerpt from the FAQ there:
Q: Engine block casting dates. What and when? What is the correct engine casting numbers for a BOSS 302 block? What casting date code ranges should be on a BOSS 302 block? A1: My car 9F02G194310 has its original block which is a C8FE casting. These are the race block castings not machined for dry deck. These blocks were used for a time in place of the C9 castings. I read that late '69 cars were built with D0ZE-A blocks. This is possible since I have a D0ZE-A block cast in late June 69. A2: Casting numbers on a BOSS 302 should be C80E-6015-B, C8FE-6015-B for early '69. C9ZE-6015A or B or D0ZE-6015-A for '69. D0ZE-6015-B for '69 & '70. D1ZE-6015-B for service block. Example of date code in casting C9ZE is C meaning the decade, 9 meaning year, Z meaning car line, E meaning Eng. div. If the engine is originally installed it will have the [COLOR=blue ! important]Mustang's[/COLOR] partial VIN stamped into the rear of the block, just above the area where the bellhousing attaches. Example is 9F02G196957 will have 196957 stamped into it. Up front a small flat area on the [COLOR=blue ! important]driver's side[/COLOR] carried another code that identified the engine build date. Several digits appeared only the first two decode as the date. The first digit is the last numeral of the year. For example, 9 is 1969, the second is the month. Example A is January.
 
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