SP350/357 Base 350ci Engine
INSTALLATION NOTES:
- Use the Holley 670 cfm four-barrel carburetor 809-19170092 to achieve the listed horsepower and torque
- Requires four-barrel carburetor, intake manifold, distributor, spark plug wires, external balance flexplate, water pump, and additional components to complete assembly
- Distributors with melanized steel gear MUST be used with steel camshafts, or engine damage will occur.
- Some assembly and minor engine tuning required
- Not intended for marine application
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.
19433032 supersedes 19420881, 19431612, 19431612, 19420870, 19420870, and 19367080
Specifications:
-
The New Standard for Affordable Small-Block Performance!
If it’s affordable performance you’re looking for to power your project car or truck, Chevrolet Performance’s SP350/357 delivers! With 357 horsepower and a deep reserve of low-rpm torque, it quickly reminds you why Chevrolet’s original 350 small block has been the industry benchmark for decades.
Show More
The SP350/357 leverages the strength of a strong rotating assembly secured in a brand-new block with four-bolt main caps, along with their economical Vortec iron cylinder heads. A roller camshaft optimizes the airflow capability of the cylinder heads which really improves drivability.
This SP350/357 base engine topped with a Chevrolet Performance dual-plane intake manifold and Holley 670-cfm 4-barrel carburetor all adds up to a 24-horsepower gain over the 350 HO crate engine – and a great, affordable alternative to rebuilding.
This base crate engine package includes an assembled long block, including the oil pan and valve covers. The perfect foundation for you to finish it off your way, with the ignition system, induction system and accessories.
SP350/357 BASE TECH SPECS:
- Engine Type: Chevy Small-Block V-8
- Displacement: 350ci
- Bore x Stroke: 4.000” x 3.480”
- 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″ intake / .473″ exhaust
- Camshaft Duration (@.050 in.): 215° intake / 223° exhaust
- Cylinder Heads: Vortec cast iron, 64cc combustion chambers
- Valve Size: 1.940” intake / 1.500” exhaust
- Compression Ratio: 9.0:1
- Rocker Arms: Stamped steel
- Rocker Arm Ratio: 1.5:1
- Recommended Fuel: Premium pump
- Ignition Timing: 32° Total @ 4000 rpm
- Maximum Recommended RPM: 5600
- Balanced: External
- Flexplate: 12.750″
Reviews
There are no reviews yet.