New from Ohio Speed Shops – the Street Boss 604 V8. This V8 delivers more power than any 350 small-block ever devised for a production vehicle, rated at 405 hp and 406 lb-ft of torque. See more details below.

Official Release:

Ohio Speed Shops new Street Boss 604 delivers more power than any 350 Small-Block ever installed in a production vehicle. Rated at 405 hp and 406 lb.-ft. of torque, it derives its range-topping performance from unique, lightweight aluminum cylinder heads that enable optimal airflow at high rpm.

The cylinder head casting is based on the proven Fast Burn design, with large intake runners and 2.00/1.55-inch valves. Beehive-style valve springs deliver greater high-rpm performance and durability. Their egg-shaped profiles have less reciprocating mass in motion, require less spring pressure for greater valve control and handle valvetrain stresses more efficiently. They allow the Street Boss 604 to rev higher to make the most of every cubic inch of air drawn through it.

The Street Boss 604 also uses an aggressive hydraulic roller camshaft that supports the engine’s high-rpm airflow capability while maintaining excellent low-speed drivability.

Features:

• Rated at 405 hp and 406 lb-ft of torque
• Lightweight aluminum cylinder heads enable optimum airflow at high rpm
• Beehive-style valve springs deliver greater high-rpm performance and durability