Although big blocks were used in the movie, in the summer of 1962 Chevy was still sorting out the problems of 409s and the 348 was so heavy (started life as a truck engine) that in real life the 55 would have probably had a small block, thus the high reving 327 SFX during the street race scene and over-rev SFX when it flipped. Just never sounded like a big block to me. The 327 was an instant screaming success. I was a senior in 1962 and we used to sneak a race in occasionally @ lunch time. One day a guy from another school visited us in a silver 57 with a 327 FI & posi. He left so hard it made our heads spin! Never saw or heard anything like that in my life! No one would race him.