how old is my spare 346

[boothandco]

HOw do I determine the age of a 346 I purchased from a guy in Colorado, who was clearing out a garage full of stuff in his fathers estate?  He thinks it is about a 46 or 47.  I want it as a back up to my 37.  How do I find out what I have?

[Bill Ingler #7799]

Here is the engine serial number chart. This should help.  Bill

[boothandco]

Thanks bill, that will help a ton!