Yeah I just went by I6 decoding instructions, but I can say that:
289 is the displacement of the engine (duh)
66 is the model year of the engine
10 is the change level I think (also not sure what this means)
236-S is the engine code number which says what kind of fuel it uses and what model car it was made for.
Edit: I believe C means the Cleveland Assembly plant.
1965 Wimbledon White Mustang Inline-6 200
1994 Canary Yellow Mustang GT 5.0
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Last edited by Canary94GT; 09-04-2009 at 12:59 PM.