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421 vs. 389 block ID
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TOPIC: 421 vs. 389 block ID
421 vs. 389 block ID 5 Years, 3 Months ago  
I ran across an interesting thread on the PY forum, with good pics showing how to differentiate a 389 block vs. a 421:
Click here for link

Invariably I check out every 421-badged Poncho to see if it is the "real thing". Amazing how often the badges are lying, or (in the case of '65 or'66 2+2's, which all came with a 421) no longer have the correct engine.
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