Chevy's HT502 makes peak horsepower at 4,200 RPM and its highest torque at 3,200 RPM. The 502 HO and ZZ502/502 achieve their highest horsepower values at 5,100 and 5,200 RPM, respectively.

Chevy's 502-cubic-inch crate engine is available as HT502, 502 HO, ZZ502/502, or SP502/605 options. As a result, the 502 big block offers a range of horsepower ratings.

Trimming 2 more inches from the tubes reduced total runner length to 15½inches; horsepower and torque fell off slightly to 525.1 hp at 5,500 rpm/604.3 lb-ft at 4,000 rpm.

In the August issue, we showed how to take a GM crate 502 big-block and make 650 horsepower with bolt-on parts. Kevin McClelland at Flowmaster built the engine and used a stock Marine short-block ...

Chevy's 502-cubic-inch crate engine is available as HT502, 502 HO, ZZ502/502, or SP502/605 options. As a result, the 502 big block offers a range of horsepower ratings.