The SP350/357 leverages the strength of a strong rotating assembly secured in a brand-new block with four-bolt mains, along with economical Vortec iron cylinder heads. Its durable assembly is designed to offer years of high-performance excitement at an exceptional value.

The SP350/357 Deluxe package includes the intake manifold, distributor, harmonic damper, and flexplate.

GM Warranty

SP350/357 DELUXE TECH SPECS:

• Engine Type: Chevy Small-Block V-8
• Displacement: 350 ci
• Bore x Stroke: 4.000 in.  x 3.480 in.
• Block: Cast-iron with four-bolt main caps
• Crankshaft: Nodular iron, 1-piece rear main seal
• Connecting Rods: Powdered metal
• Pistons: Cast aluminum
• Camshaft Type: Hydraulic roller
• Camshaft Lift: .473 in. intake / .473 in. exhaust
• Camshaft Duration (@.050 in.): 215-degrees intake / 223-degrees exhaust
• Cylinder Heads: Vortec cast iron, 64 cc combustion chambers
• Valve Size: 1.940 in. intake / 1.500 in. exhaust
• Compression Ratio: 9.0:1
• Rocker Arms: Stamped steel
• Rocker Arm Ratio: 1.5:1
• Intake Manifold: Dual plane
• Carburetor: Holley 670-cfm 4-barrel
• Distributor: HEI
• Recommended Fuel: Premium pump
• Ignition Timing: 32-degrees Total @ 4000 rpm
• Maximum Recommended RPM: 5600
• Balanced: External
• Flexplate: 12.750 in.

INSTALLATION NOTES:

• Holley 670-cfm four-barrel carburetor included but not installed on engine
• Comes with 12.750' externally balanced 153-tooth automatic transmission flexplate. Change to externally balanced flywheel for manual transmission applications.
• Not intended for marine application

Note:

• This part number supersedes 809-19367082
• Starter not included

Engine Break-In Procedure

Use conventional or break-in oil (non-synthetic) for the first oil change, be sure to check the oil level in the engine and prime the oil system with an engine priming tool. 

Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPMs, with no load on the engine for the first 30 minutes. This is critical to breaking in the camshaft.

Drive the vehicle with varying speeds and loads on the engine for the first 30 miles. Be sure not to use a lot of throttle or high RPM.  Run five or six medium-throttle accelerations to about 3000 RPM (40 to 50 MPH), then letting off in gear and coasting back down to 20 MPH. Run a couple of hard throttle accelerations up to about 5000 RPM (55 to 60 MPH), then letting off in gear and coasting back down to 20 MPH.

Let the engine cool and change the oil and filter using conventional (non-synthetic) oil and check the coolant level, top off if necessary. Drive the next 500 miles normally, without high RPMs (below 5000 RPM), hard use, or extended periods of high loading.  Change the oil and oil filter again using conventional (non-synthetic) oil.  Keep an eye on the oil level during the first thousand or so miles.

It would be suitable to use synthetic motor oil after the second recommended oil change and mileage accumulation.

809-19431613 supersedes 809-19420871