Question: what is the difference between a ford 427 and 428?
Answer: the 427 is a large bore short stroke motor (4.23" bore x 3.78" stroke) made to produce horsepower at high rpms. By 1965 Ford had a 427 motor that could run 7500 rpms for 24 hours. The 428 (4.13" bore x 3.98" stroke) is a low rpm torque motor for the street. Both can make the same horsepower.