For Chevy SBC 327 350 383 BBC 396 454 High Torque Gear Drive Mini Starter 2.5HP Fit for 153 or 168 tooth flywheels SB & BB Chevy 283 327 350 396 427 454 502 engines with either a staggered or straight bolt pattern, except the SB Chevy 400 engine This starter owns 2.5 horsepower with a 3.7:1 gear ratio It only weighs 10 pounds. Perfect for engines up to 450 HP and under 11-1 compression. Great for Hot Rods, Street Rods, and Pro-Street applications.