How can you tell what year the crate was built. What year did the change the heads on the 604 crate? How many laps do you run before it is a good idea to change the valve springs? What are the best headers to put on the 604? I am just getting into the crate class and am looking at a used one but I would like to know what exactly am looking at. I ahve always built my own engines and always knew what I had. Thank you for your time.
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