I rebuild and restore generators and alternators, and the reason I was asking is because I always assumed that only the high horsepower 409's had deep groove pulleys. Over the years, I have rebuilt/restored quite a few generators from 409 cars, and most that I believed to be original units, did not have deep groove pulleys. I know that Delco Remy used the same generator number for just about all V-8's (1102097) from 1958 to 1962, and provided them to Chevrolet without pulleys. However, recently I received an email from someone who claimed to be an expert on 409 cars, and he said that all 409's had deep groove pulleys. Thus the reason for my question, because I do not claim to be an expert on 409 cars. Thank you again.