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I just bought a rough 69 coupe, and the motor doesn't seem original.
It was a 350/350HP based on the console ID plate, and as old and nasty it is, I believe its the original plate.
I checked nasty z28.com for codes, and this one didn't appear!
K0173TDS is stamped on the pad. Haven't got to the casting number; too much snow on the car!
It's strange that there's no VIN derivative on the pad- why is the paint so fresh there and so dirty everywhere else?
I am curious about that too. Very curious! Funny thing is, there is no overspray around the pad, and it doesn't look like it was swabbed on.
I just bought this car...it IS rough and dirty and off the road for a number of years. Judging by the overall looks of the engine bay and the car in general, I can't imagine anyone was trying to deceive anyone.
Obviously not the original motor...but it is orange everywhere with no blue to be found.
Was there ever a replacement motor stamped with anything other than CE, maybe early on?
...I found "TDS" to be 1980, 350ci, 170hp, 4bbl, manual transmission, truck application in the "Lime Book".
...near the bellhousing flange "peak", passenger side of peak, opposite your casting number, will be a date code. Will read like "B250" for February 25, 1980 or like D299, which would be April 29, 1979.