SP350/357 Base

Description

A New Standard for Affordable Small-Block Performance!
If you’re looking for a budget-friendly powerhouse to bring your classic or custom build to life, the Chevrolet Performance SP350/357 Crate Engine is your answer. Delivering 357 horsepower and a strong reserve of low-end torque, this engine proves why the legendary Chevy 350 Small-Block remains the gold standard in performance and reliability.
Built with a brand-new 4-bolt main block, durable Vortec iron heads, and a hydraulic roller camshaft that enhances airflow and drivability, the SP350/357 provides a smooth, responsive performance with modern engineering. It delivers 24 more horsepower than the 350 HO—offering an unbeatable combination of power, longevity, and value for your project.
This base configuration is perfect for builders who prefer to complete their setup with their own accessories, carburetor, or intake system. For complete ready-to-run options, check out the SP350/357 Deluxe (P/N 12677170) or Turn-Key (P/N 12677177) packages.
TECH SPECS

Part Number: 12677167 / 19367080

Engine Type: Chevy Small-Block V-8

Displacement: 350 cu in (5.7L)

Bore x Stroke: 4.000″ x 3.480″

Block (P/N 10105123): Cast iron with 4-bolt mains

Crankshaft: Forged steel

Connecting Rods (P/N 10108688): Powdered metal

Pistons (P/N 88894280): Cast aluminum

Camshaft Type (P/N 12677151): Hydraulic roller

Camshaft Lift: 0.473″ intake / 0.473″ exhaust

Camshaft Duration (@.050″): 215° intake / 223° exhaust

Cylinder Heads (P/N 12558060): Cast iron; 64cc chambers

Valve Size: 1.940″ intake / 1.500″ exhaust

Compression Ratio: 9.0:1 nominal

Rocker Arms (P/N 10089648): Stamped steel

Rocker Arm Ratio: 1.5:1

Recommended Fuel: Premium pump gas

Ignition Timing: 32° total @ 4,000 rpm

Maximum Recommended RPM: 5,600

Balanced: External

Flexplate: Not included

Intake Manifold: Not included
INSTALLATION NOTES

Use Holley 670-cfm 4-barrel carburetor (P/N 19170092) to achieve rated power and torque.

Requires intake manifold, carburetor, distributor, spark plug wires, and water pump to complete assembly.

Use externally balanced flexplate for automatic or externally balanced flywheel for manual transmissions.

Requires neutral balanced damper.

Designed for pre-1976 street vehicles or off-road builds.

Not approved for marine applications.

Distributor must include a melonized steel gear when paired with steel camshafts to prevent damage.
Key Benefits

Proven Chevrolet durability with modern roller-cam efficiency

Strong 4-bolt block for long-lasting reliability

Ideal for street rods, muscle cars, and budget builds

Backed by Chevrolet Performance’s 24-month / 50,000-mile warranty