Roadrunner or Not

Hersbird said
Another possibility not mentioned is somebody in the mid 70s was trying to scam their insurance agent and modified the VIN the other way to say, "yeah, its just a 318!" That seems like a lot of trouble for a few bucks savings but people seem to go to great measures to save a buck sometimes.
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My very first car at that I bought at 16yr's old, was a 1972 charger R/T 340. the 340 was long gone and it had a 318. the vin # on the title had been changed to a 318 before I got it. this was in 1983, & that car was from Texas. I always assumed it was for insurance rate purposes.