Chevrolet’s 350 small-block went through four dramatically different personalities in barely a decade — from the 425-horsepower NHRA-rated LT-1 in 1970 to a computer-assisted, 190-horsepower L81 just eleven years later. Tracing the L46, LT-1, L82, and L81 in sequence lays out exactly how emissions rules and changing priorities reshaped one of GM’s most important engines. Read on for the full breakdown, casting numbers included.