SP350/357 Base Chevrolet Crate Engine


  • Replaces P/N 12677167 &
  • 357 hp @ 5,500 rpm/407 lb.-ft. @ 4,000 rpm
  • Hydraulic Roller Camshaft

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SKU: 19433032 Categories: , Tag:

350/357 Base Crate Engine

P/N 19420881

357 hp @ 5,500 rpm / 407 lb.-ft. @ 4,000 rpm

350/357 Base Tech Specs:
Engine Type: Chevy Small-Block V-8
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 10243070): Nodular Iron
Connecting Rods (P/N 10108688): Powdered metal
Pistons (P/N 88894280): Cast aluminum
Intake Manifold (P/N 12676887): Dual plane
Camshaft Type (P/N 12677151): Hydraulic roller
Valve Lift (in): 0.473 intake / 0.473 exhaust
Camshaft Duration (@.050 in): 215° intake / 223° exhaust
Cylinder Heads: (P/N 12558060) Cast iron; as cast with 64cc chambers
Valve Size (in): 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
Ignition Timing: 32º Total @ 4,000 rpm
Maximum Recommended rpm: 5,600
Balanced: External

For more complete versions of this crate engine, see the GM Performance SP350/357 Deluxe P/N 19367082 and the SP350/357 Turn Key P/N 19367084.

Installation Notes:

  • Use the Holley 670-cfm 4-barrel carburetor P/N 19170092 to achieve the listed horsepower and torque
  • Requires intake manifold, carburetor, distributor, spark plug wires and water pump to complete assembly
  • Requires feed line from fuel pump to carburetor
  • Requires externally balanced flexplate or flywheel for manual transmission.
  • Designed for pre-1976 street vehicles or any off-road vehicle
  • Not intended for marine applications

Note: Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.

Replaces P/N: 19367080 19420870 19431612 and

Weight 477 lbs


12677167, 19367080, 19420870, 19431612

350/357 Base Crate Engine

19420881 Chevrolet Motor

A New Standard for Affordable Small Block Performance!

If affordable performance is on your shopping list, the Chevrolet Performance SP350/357 delivers! The SP350/357 leverages the strength of a strong rotating assembly secured in a brand-new block with four-bolt mains, Vortec iron cylinder heads and the roller camshaft optimize drivability and airflow capability. It all adds up to a 24-horsepower gain over our 350 HO crate engine.

The base crate engine package includes an assembled long block, including the oil pan. You finish it off your way, with the ignition system, induction system and additional accessories. Deluxe and Turn-Key also available.

SP350/357 Base Crate Engine

Click here to download installation information.

SP350/357 Base Crate Engine

Chevrolet Performance Crate Engines include a 24-month or 50,000-mile (80,000 kilometer) limited warranty.

Click here for more detailed warranty information.


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to