ATK HP46C-MAG 408 Stroker Crate Engine – 465 HP / 535 TQ Mopar Magnum V8

The Ultimate 408 Stroker Crate Engine for Mopar Performance Builds

The ATK HP46C-MAG 408 stroker crate engine delivers massive small-block Mopar power in a complete Stage 3 package that’s ready to transform your classic Charger, Challenger, Road Runner, or truck. As part of our extensive Hemi Engines collection, this 6.7L/408 cubic inch stroker V8 produces an impressive 465 horsepower and a staggering 535 lb-ft of torque—making it one of the most formidable naturally aspirated small-block Mopar crate engines in ATK’s Stage 3 lineup .

Built on a seasoned OE 1993-2001 Magnum block with a forged rotating assembly and Edelbrock aluminum cylinder heads, this 408 Pro Series engine is dyno-tested and backed by a 2-year/unlimited mileage warranty . Whether you’re building a weekend warrior, a street machine, or a show-stopping classic, this ATK 408 stroker crate engine provides the foundation for an unforgettable Mopar driving experience.

What Makes the ATK 408 Stage 3 the Ultimate Small Block Mopar Crate Engine?

The HP46C-MAG is engineered for enthusiasts who want maximum horsepower and torque from a classic small-block Mopar platform. Based on the proven 1993-2001 Magnum roller block, this 408 stroker combines an Edelbrock Performer RPM aluminum cylinder heads with a forged rotating assembly for exceptional durability and power .

This Stage 3 Complete variant includes a Quick Fuel 780 cfm carburetor, Edelbrock Performer RPM Air Gap intake manifold, MSD Pro Billet distributor, and all necessary components—making it a true turn-key solution .

408 Stroker Horsepower and Torque Figures

This Mopar crate engine produces staggering output:

• 465 horsepower – dyno tested and verified 

• 535 lb-ft torque – massive torque for street and strip 

• 10.1:1 compression ratio – pump gas friendly 

• Hydraulic roller cam – streetable performance with excellent durability

• Lopey idle – unmistakable Mopar character 

Complete 408 Stroker Engine Specifications

Seasoned OE Magnum Block

The foundation of this ATK 408 stroker is a seasoned OE 1993-2001 Magnum block featuring :

• 1993-2001 Magnum roller block – the best small-block Mopar foundation

• 4.040-inch bore x 4.000-inch stroke

• 408 cubic inch displacement (6.7L)

• Internal engine balance

• OE front sump 5qt oil pan

Forged Rotating Assembly

The rotating assembly is built for durability and high horsepower :

• Scat nodular iron crankshaft – 4.000-inch stroke, internally balanced

• 4340 forged I-beam connecting rods with ARP 8740 bolts (5.7″ length)

• Forged pistons – 10.1:1 compression

• Moly piston rings

Edelbrock Performer RPM Aluminum Cylinder Heads

The Edelbrock Performer RPM aluminum cylinder heads provide exceptional flow :

Hydraulic Roller Camshaft Specifications

What’s Included with Your HP46C-MAG Stage 3 Crate Engine

The HP46C-MAG comes as a complete Stage 3 dressed engine with the following components included :

Important Note: Flexplate/flywheel is NOT included and must be sourced separately . A Magnum internal balance flexplate is required.

Installation Notes and Critical Considerations

Important Notes Before Installation

Before installing your ATK HP46C-MAG, review these critical notes :

• Octane requirement: 91+ premium fuel required

• Stall converter: 2500+ RPM recommended for automatic transmission

• Headers: 1-3/4″ primary tubes recommended

• Exhaust headers required – will not work with factory manifolds

• Flexplate: Magnum internal balance (not included)

• Firing order: 18436572

• Total timing: 34-36 degrees

• Oil: 10W30 conventional (non-synthetic) during break-in

• Spark plug gap: .035″

• Vacuum: 10-11″ at 800 RPM / 12-13″ at 1000 RPM / 16″ at 1500 RPM / 18″ at 2500 RPM

Core Return Information

A core charge of $260.00 applies . Core return can be any Small Block Chrysler 360ci engine .

Break-In Procedure

ATK recommends the following break-in procedure :

• Use break-in oil or conventional (non-synthetic) 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

• Check engine oil and coolant levels daily

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

• After the first 5,000 miles, synthetic engine oil may be used

Emissions Compliance

Non-Emissions: This product does not require an Executive Order in California. By nature of its design, it is legal for sale and use in all 50 states . Not intended for marine use – marine use voids all warranties .

Warranty

ATK High Performance backs the HP46C-MAG with a 2-year / unlimited mileage warranty .

ATK HP46C-MAG Engine FAQs

What is the horsepower and torque of the HP46C-MAG?

The ATK HP46C-MAG produces 465 horsepower and 535 lb-ft of torque .

What vehicles is the HP46C-MAG compatible with?

The HP46C-MAG is a direct replacement for vehicles originally equipped with small-block Chrysler V8s. Compatible applications include 1962-1976 Dodge, Plymouth, and Chrysler vehicles .

What’s included with the HP46C-MAG?

The HP46C-MAG is a complete Stage 3 dressed engine including the block, Edelbrock aluminum heads, forged rotating assembly, Edelbrock intake, Quick Fuel 780 cfm carburetor, MSD distributor, water pump, harmonic balancer, oil pan, valve covers, timing cover, fuel pump, spark plugs, and wires. Flexplate is not included .

What fuel does the 408 stroker require?

91+ octane premium fuel is required for optimal performance .

What is the warranty on the HP46C-MAG?

ATK High Performance backs the HP46C-MAG with a 2-year / unlimited mileage warranty .

Is the HP46C-MAG emissions legal?

Yes. This product is non-emissions and does not require an Executive Order in California. By nature of its design, it is legal for sale and use in all 50 states .

Can the HP46C-MAG be used in marine applications?

No. This engine is not intended for marine use. Marine use voids all warranties .

What is the current price of the HP46C-MAG?

Summit Racing lists the HP46C-MAG at $9,272.99**, while JEGS lists it at **$10,179.00 with a $260.00 core charge . Contact NH Race Engine for current European pricing and availability.