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hp @ 5400 rpm

The versatile ZZ4 350 adapted for Circle Track competition

Renowned for its deep reserve of torque, responsive power, and great dependability, the ZZ4 350 crate engine is one of Chevrolet Performance’s most popular crate engines — and our engineers have adapted that combination as a winning, affordable racing engine in the CT355!

The CT355’s strength lies in its ZZ4 bottom end, which includes a block with four-bolt mains, a forged-steel crankshaft and high-silicon pistons. A steel hydraulic roller camshaft actuates valves in the high-flow aluminum ZZ4 heads, which boast 163-cc intake ports and 1.94/1.50-inch valves. This combination makes good power and great torque: 356 hp and 406 lb-ft.

Like our other Circle Track crate engines, the CT355 includes a racing oil pan with a dual kick-out design. It also includes a valve cover breather kit, a special “kool nut” rocker arm nut design, a dual-plane aluminum high-rise intake manifold, cast-iron water pump, HEI distributor, and balancer. You add the carburetor, starter, spark plugs, and wires — all available from chevroletperformance.com.


Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.


Part Number:
Engine Type:
Chevy Small-Block V-8
Displacement (cu. in.):
Bore x Stroke (in.):
4.000 x 3.480
Block (P/N 10105123):
Cast-iron with four-bolt main caps
Crankshaft (P/N 12556307):
Forged steel
Connecting Rods (P/N 10108688):
Powdered metal steel
Pistons (P/N 10159436):
Hypereutectic aluminum
Camshaft Type (P/N 10185071):
Steel hydraulic roller
Camshaft Lift (in.):
.474 intake / .510 exhaust
Camshaft Duration (@.050 in.):
208° intake / 221° exhaust
Cylinder Heads (P/N 12556463):
Aluminum; 58-cc chambers
Valve Size (in.):
1.940 intake / 1.500 exhaust
Compression Ratio:
10:16 Nominal
Rocker Arms (P/N 10089648):
Stamped steel
Rocker Arm Ratio:
Recommended Fuel:
92 octane
Ignition Timing:
Base 10° BTDC, 32° Total
Maximum Recommended rpm:


Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

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    • Requires addition of carburetor, starter, plug wires, and exhaust system (not included)

    • Requires an externally balanced flywheel (not included)

    • The 8-quart Circle Track oil pan is 7 inches deep at the sump. It will clear most GM rear-steer chassis with stock engine location

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Download a catalog for a full listing of components and related parts.

Carburetor, Holley 670-cfm • P/N 19170092

High-Torque Mini-Starter • P/N 12361146

Fuel Pump, Street Performance • P/N 12355612

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.

Destination Freight Charges

To allow you to do an accurate price comparison with prices featured on other Internet sites, GM provides Internet pricing both with and without the Destination Freight Charge (see prices including Destination Freight Charge below). To get full pricing details, go to our Build Your Own section.