ATK HP33C 383 Stroker Crate Engine – 390 HP / 460 TQ

The Ultimate 383 Vortec Stroker Crate Engine for Serious Street Performance

The ATK HP33C 383 stroker crate engine delivers serious street performance in a long block package that’s ready to transform your classic Chevy, hot rod, or truck build. As part of our extensive Small Block Chevy collection, this 383 cubic inch Vortec V8 produces an impressive 390 horsepower and 460 lb-ft of torque —making it one of the most formidable naturally aspirated small-block crate engines in ATK’s Stage 3 lineup. Whether you’re building a weekend cruiser, a street machine, or a towing rig, this ATK 383 stroker delivers the power, reliability, and unmistakable small-block character that Chevy enthusiasts demand.

What Makes the ATK 383 Vortec Stroker a Serious Performer?

The ATK HP33C is engineered for enthusiasts who demand maximum performance from a classic small-block platform. Built on a seasoned 1996-2000 GM roller block with a 4-bolt main and 1-piece rear main seal, this 383 stroker combines Vortec-style cast iron cylinder heads with a Scat forged rotating assembly for exceptional durability and power. The combination of 383 cubic inches and carefully matched components creates the ground-pounding torque and horsepower that only a stroker can provide .

383 Stroker Horsepower and Torque Figures

This 383 crate engine produces impressive output:

• 390 horsepower – dyno tested and verified

• 460 lb-ft torque – massive low-end and mid-range grunt

• 9.7:1 compression ratio – pump gas friendly

• Hydraulic roller cam – low maintenance, excellent durability

Complete 383 Stroker Engine Specifications

Seasoned GM Block and Rotating Assembly

The foundation of this ATK 383 stroker is a seasoned GM roller block featuring:

• 4-bolt main caps for exceptional bottom-end strength

• 1-piece rear main seal for leak-free operation

• 4.040-inch bore x 3.750-inch stroke 

• Internal front / external rear engine balance 

• Scat nodular iron crankshaft for durability

• Scat 4340 forged I-beam connecting rods with ARP 8740 bolts

• Hypereutectic pistons with moly rings

• 9.7:1 compression ratio 

Dart Vortec Cast Iron Cylinder Heads

The Dart Vortec cast iron cylinder heads provide exceptional flow:

• 67cc combustion chambers 

• 165cc intake runners 

• 2.02-inch intake valves 

• 1.60-inch exhaust valves 

• Stamped steel 1.5:1 ratio rocker arms 

Hydraulic Roller Camshaft Specifications

What’s Included with Your Stage 3 Crate Engine

The HP33C comes as a long block assembly with the following components included :

Important Note: This is a long block assembly. The following components are not included and must be sourced separately :

• Intake manifold (Edelbrock Performer RPM dual plane recommended)

• Carburetor (Quick Fuel 680cfm recommended)

• HEI distributor (with iron gear)

• Water pump (OE long pump)

• Harmonic balancer (internally balanced)

• Flexplate/flywheel (external balance)

• Spark plugs and wires

• Fuel pump

Installation Notes and Critical Considerations

Important Notes Before Installation

Before installing your ATK HP33C crate engine, review these critical notes :

• Oil pan compatibility: Rear sump 5qt oil pan is NOT compatible with Chevelles with steering behind the crossmember, some Corvettes, and 1962-1967 Chevy IIs

• Octane requirement: 91+ premium fuel recommended

• Exhaust: 1-5/8″ headers recommended

• Stall converter: Stock torque converter suitable

• Flexplate: External balance 168 tooth required

• Balancer: Internal balance required

• Spark plug gap: .035″

• Total timing: 34-36 degrees

• Firing order: 1-8-4-3-6-5-7-2 

Break-In Procedure

ATK recommends the following break-in procedure :

• Use break-in oil or conventional 10W30 oil with zinc additive for the first 500 miles

• Do not drive for long periods at any single speed – vary your speed

• Do not tow a trailer or put heavy loads on the vehicle

• Avoid long periods of idling

• Check engine oil and coolant levels daily

• At 500 miles, change oil and filter using conventional (non-synthetic) oil

Core Return Information

A core charge of $410.00 applies . Core return can be any small-block Chevy 350ci engine, except 1992-1997 LT1-style engines.

HP33C vs Other ATK 383 Offerings

ATK offers multiple 383 stroker variants:

The HP33C is the premium option with higher compression and additional power .

ATK HP33C Engine FAQs

What vehicles is the HP33C compatible with?

The HP33C is a direct replacement for any vehicle originally equipped with a small-block Chevy. Note that the included oil pan is not compatible with Chevelles with steering behind the crossmember, some Corvettes, and 1962-1967 Chevy IIs .

How much does the ATK HP33C crate engine cost?

The ATK HP33C is priced at approximately **$5,998.99** . A $410.00 core charge applies. Contact NH Race Engine for current European pricing and availability.

What’s included with the HP33C?

The HP33C is a long block assembly including the seasoned GM block, Dart Vortec heads, forged rotating assembly, hydraulic roller cam, oil pan, valve covers, timing cover, and oil pump. Intake manifold, carburetor, distributor, water pump, and flexplate are not included .

What fuel does the HP33C require?

91+ octane premium fuel is recommended for optimal performance .

What is the warranty on ATK engines?

ATK High Performance engines are backed by a warranty. Contact NH Race Engine for specific European warranty coverage details.

Is the HP33C the same as the HP33?

No. The HP33 is a Stage 1 engine producing 380 HP with 9.5:1 compression at approximately $4,633.99 . The HP33C is a Stage 3 engine producing 390 HP with 9.7:1 compression at approximately $5,998.99 .

Why Choose NH Race Engine for Your SBC Crate Engine?

As a Netherlands-based specialist serving performance enthusiasts across Europe, NH Race Engine brings unmatched expertise to your small-block Chevy project. We understand the unique requirements of European builds—from shipping logistics to regional considerations. Browse our Small Block Chevy collection and other crate engine offerings to find the perfect solution for your build.

Order Your ATK HP33C Crate Engine from NH Race Engine Today

The ATK HP33C 383 stroker crate engine delivers exceptional value with its combination of forged internals, Vortec cylinder heads, and ground-pounding torque. With ATK’s hand-built quality and NH Race Engine’s European distribution network, you can trust that your replacement engine delivers the quality and reliability you demand.

Contact NH Race Engine today to discuss your HP33C engine requirements. Our expert team can help you navigate compatibility, shipping, and installation considerations for your European build.