ATK HP80 347 Stroker Crate Engine – 410 HP / 415 TQ Ford Windsor V8

The Ultimate Ford 347 Stroker Crate Engine for Windsor Performance Builds

The ATK HP80 347 stroker crate engine delivers serious street performance in a long block package that’s ready to transform your classic Ford Mustang, truck, or hot rod. As part of our extensive Ford Windsor collection, this 347 cubic inch stroker V8 produces an impressive 410 horsepower and 415 lb-ft of torque —making it one of the most formidable naturally aspirated small-block Ford crate engines in ATK’s Stage 1 lineup . Whether you’re building a weekend cruiser, a street machine, or a show-winning classic, this ATK 347 stroker delivers the power, reliability, and unmistakable small-block Ford character that enthusiasts demand.

What Makes the ATK 347 Stroker a Serious Performer?

The ATK HP80 is engineered for enthusiasts who demand maximum performance from a classic Ford Windsor platform. Built on a handpicked, seasoned 1987-1995 OE roller block with a 4-bolt main and 1-piece rear main seal, this 347 stroker combines Dart Pro 1 aluminum cylinder heads with a Scat forged rotating assembly for exceptional durability and power . The combination of 347 cubic inches and carefully matched components creates the ground-pounding torque and horsepower that only a stroker can provide .

347 Stroker Horsepower and Torque Figures

This 347 crate engine produces impressive output:

• 410 horsepower – dyno tested and verified 

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

• 10.2:1 compression ratio – pump gas friendly 

• Hydraulic roller cam – low maintenance, excellent durability 

Complete 347 Stroker Engine Specifications

Seasoned Ford Block and Rotating Assembly

The foundation of this ATK 347 stroker is a seasoned 1987-1995 OE 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 3.400-inch stroke 

• External engine balance, 28 oz. imbalance 

• Scat nodular iron crankshaft for durability 

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

• Forged flat-top pistons with moly rings 

Dart Pro 1 Aluminum Cylinder Heads

The Dart Pro 1 aluminum cylinder heads provide exceptional flow :

• 58cc combustion chambers

• 170cc intake runners

• 2.02-inch intake valves

• 1.60-inch exhaust valves

• Billet aluminum 1.6:1 ratio full roller rocker arms 

Hydraulic Roller Camshaft Specifications

What’s Included with Your Stage 1 Crate Engine

The HP80 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 or Pro Billet distributor (with steel gear) 

• Water pump (standard rotation, RH inlet) 

• Harmonic balancer (external balance, 28oz) 

• Flexplate/flywheel (external balance, 28oz, 164 tooth) 

• Spark plugs (Autolite #3923, gap .035″) 

Installation Notes and Critical Considerations

Important Notes Before Installation

Before installing your ATK HP80 crate engine, review these critical notes :

• Oil pan compatibility: Front sump style oil pan included

• Octane requirement: 91+ premium fuel recommended 

• Exhaust: 1-5/8″ headers recommended 

• Stall converter: 2400-2800 RPM recommended for automatic transmission 

• Flexplate: External balance 28oz, 164 tooth required 

• Balancer: External balance 28oz required 

• Spark plug gap: .035″ 

• Total timing: 34-36 degrees 

• Firing order: 1-3-7-2-6-5-4-8 

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 of operation

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

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

• Avoid long periods of idling during this period

• Check engine oil and coolant levels daily

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

Note: This is a roller cam engine, so the camshaft break-in procedure is less critical than with flat-tappet cams. However, following the recommended break-in procedure will ensure optimal ring seal and engine longevity.

Core Return Information

A core charge of $310.00 applies . Core return can be any Small Block Ford 302ci engine .

ATK HP80 Engine FAQs

What vehicles is the HP80 compatible with?

The HP80 is a direct replacement for any vehicle originally equipped with a small-block Ford Windsor, including 1965-1996 Ford Mustang and 1974-1978 Mustang II .

How much does the ATK HP80 crate engine cost?

The ATK HP80 is priced at approximately **$5,810.99** . A $310.00 core charge applies . Contact NH Race Engine for current European pricing and availability.

What’s included with the HP80?

The HP80 is a long block assembly including the seasoned Ford block, Dart Pro 1 aluminum heads, forged rotating assembly, hydraulic roller cam, front sump oil pan, valve covers, timing cover, timing set, and oil pump . Intake manifold, carburetor, distributor, water pump, and flexplate are not included .

What fuel does the HP80 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 24-month / unlimited mileage warranty .

What is the difference between HP80 and HP80C?

The HP80 is a Stage 1 long block (base engine) . The HP80C is a Stage 3 complete EFI engine that includes FiTech self-learning EFI, intake manifold, distributor, water pump, harmonic balancer, flexplate, spark plugs, wires, and ECU .

Is this engine emissions legal?

This engine is not for use in pollution-controlled vehicles . It is designed for pre-1966 street vehicles, off-road applications, or competition use only.

Why Choose NH Race Engine for Your Ford Crate Engine?

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

Order Your ATK HP80 Crate Engine from NH Race Engine Today

The ATK HP80 347 stroker crate engine delivers exceptional value with its combination of forged internals, Dart Pro 1 aluminum heads, and street-stomping 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 HP80 engine requirements. Our expert team can help you navigate compatibility, shipping, and installation considerations for your European build.