A legendary foundation for performance Building on the strength and power of its predecessors, Chevrolet Performance engineers have upped the ante with a revised cylinder head design, new valvetrain components, and more to create the SP350/385 Base—a 385-horsepower 350 with loads of low-end torque. In fact, the SP350/385 Base Small-Block engine produces at least 405 lb-ft of torque by only 3600 rpm for a thrilling feeling of immediate performance. 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, as the egg-shaped springs have less reciprocating mass in motion, require less spring pressure for greater valve control, and handle valvetrain stresses more efficiently. As with all of Chevrolet Performance’s Small-Block crate engines, the SP350/385 Base is built with a brand-new block with four-bolt mains. It also features 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. The base crate engine package includes an aluminum intake manifold, distributor, water pump, damper, flexplate, and more.
Part Number: 19333157
Engine Type: Chevy Small-Block V-8
Displacement (cu in): 350
Bore x Stroke (in): 4.000 x 3.480
Block: Cast-iron with 4-bolt main caps
Crankshaft: Forged steel (shot peened)
Connecting Rods: Powdered metal
Pistons: Hypereutectic aluminum
Camshaft Type: Hydraulic roller
Camshaft Lift (in): .474 intake / .510 exhaust
Camshaft Duration (@.050 in): 208° intake / 221° exhaust
Cylinder Heads: Fast Burn aluminum; 62cc chambers
Valve Size (in): 2.000 intake / 1.550 exhaust
Compression Ratio: 9.6:1 nominal
Rocker Arms: Stamped steel
Rocker Arm Ratio: 1.5:1
Recommended Fuel: Premium pump
Ignition Timing: 36º Total @ 4,000 rpm
Maximum Recommended rpm: 5,800
Balanced: External
Flexplate: 12.750"
Intake Manifold: Dual Plane
• Use the Holley 770-cfm 4-barrel carburetor to achieve the listed horsepower and torque
• Requires four-barrel carburetor, spark plug wires and additional components to complete assembly
• Comes with 12.750" externally balanced 153-tooth automatic transmission flexplate. Requires externally balanced flywheel for manual transmission.
• 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
• Not intended for marine applications