My VIN is: 1Z37L7S421334 (total production 49,213)
For the 1977 Corvette production year, between August 23 and September 7, 1976, the Flint Engine changed from orange paint to blue for Corvette engines.
Additionally: the alarm activator was moved from the driver side fender to the driver side door lock starting around serial number 27,373 (my '77 has the fender alarm activator).
Other 1977 Corvette somewhat rare options:
Code C49:...electro-clear rear window defogger
Code: UM2...AM/FM Stereo Radio W/Factory
8-Track Tape Player (Another first for a Corvette option) Original Radio and
working
Code: ZX2...Convenience Group (This option
consists of dome light delay, headlight warning buzzer, underhood light, low
fuel warning light, interior courtesy lights and right side visor mirror.
Code: YJ8...Aluminum Wheels
Code: V54...Luggage and Roof Panel Rack (Rare option only...factory option in 1977 as previous years this was only a dealer installed item. This luggage rack has special brackets and a strap that fit onto the rack allowing the t-top roof panels to be strapped on and you can drive the vehicle like this).