I decided to look at my car and this is what I found. My VIN is 121,XXX and has a build date of 12C.
Heads: G143 and F233
Block: A093
Intake: G193
I had the opportunity to look at another SD engine with a VIN of 123,XXX.
Heads: K282 and G143
Block: A093
Intake: K172 with the stamped 495107.
Both have numbers matching blocks and to the best of my knowledge have never had the heads/intake replaced.
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