SP350/375 - 375HP

Modern Street Performance in a Classic Small-Block Package

Chevrolet Performance’s all-new SP350/375 uses new-casting Fast Burn cylinder heads equipped with LS-style beehive valve springs for greater high-rpm performance. It’s rated at 375 horsepower.

The new, lightweight aluminum cylinder head casting is based on the proven Fast Burn design, with large intake runners and 2.00/1.55-inch valves. New beehive-style valve springs enable greater high-rpm performance and durability. They allow the SP350/375 to rev higher to make the most of every cubic inch of air drawn through it.

The SP350/375 is built with a brand-new block with four-bolt mains, along with a forged steel crankshaft, an aggressive hydraulic roller camshaft and durable, high-silicon pistons. Unique valve covers distinguish this new crate engine at a glance, too – along with Chevy “bow tie” insignias in the ends of the cylinder heads that let everyone know you’ve got the latest Chevrolet Performance hardware under the hood.

SP350/375 Base Tech specs

Engine Type: Chevy Small Block V8

Weight: 410

Horse Power: 375

Torque: 405

Displacement (cu in): 350

Bore x Stroke (in): 4.000 x 3.480

Block (P/N 10105123):

Cast-iron with 4-bolt main caps

Crankshaft (P/N 12556307): Forged Steel

Connecting Rods (P/N 10108688): Powdered Metal

Pistons (P/N 10159436): Hypereutectic Aluminum

Camshaft Type (P/N 10185071): Hydraulic Roller

Camshaft Lift (in): .474 intake / .510 Exhaust

Camshaft Duration (@.050 in): 208° Intake / 221° Exhaust

Cylinder Heads (P/N 19300955): Fast Burn Aluminum; 62cc Chambers

Valve Size (in): 2.000 intake / 1.550 Exhaust

Compression Ratio: 9.72:1 Nominal

Rocker Arms (P/N 10089648): Stamped Steel

Rocker Arm Ratio: 1.5:1

Recommended Fuel: 93 Octane

Ignition Timing: 36° Total at 4,000 rpm

Maximum Recommended rpm: 5800

Balanced: External

INSTALLATION NOTES

• Comes with 12.750 externally balanced 153-tooth automatic transmission flexplate. Change to externally balanced flywheel for manual transmission applications.
• Requires fuel line from fuel pump to carburetor
• Designed for pre-1976 street vehicles or any off-road vehicle
• Some assembly and minor engine tuning required
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine application