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May be a while, we've got a house painting project this weekend.
I'm curious if they might have had different numbers for different builds/years.
We know compression ratios, pistons, heads, etc changed over the years.
That begs the question- does a 67 built warranty block have a different reference number than a 1972 or 73, even for the same displacement engine.
There was a discussion a few months/years ago about this and at that time no one had any reference to what those numbers actually mean as far as the specifications of the build, where they might differ from the engine originally installed.