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ATK Ford 347 Stroker 410 HP HP20 Stage 1 Long Block
Down the drag strip, the powerful ATK High Performance HP20 Ford 347 Stroker uses a massive 5.7L displacement and aluminum cylinder heads to launch out of the hole instantly.
- 410 horsepower pushes heavy classic chassis quickly
- 5.7L stroked displacement maximizes sheer pulling power
- Aluminum heads reduce front end chassis weight
- External 28-ounce balance fits aftermarket rotating assemblies
Description
The 5.7L displacement and cylinder dynamics of the ATK Ford 347 Stroker 410 HP HP20 Stage 1 Long Block resolve the typical breathing limits of standard small blocks. Command dominating low end spool and acceleration during high-performance street runs. This build utilizes lightweight aluminum cylinder heads to output four hundred ten horsepower reliably.
Engine Architecture & Core Specifications
- Block Material: Cast iron Ford Windsor Small Block, precision machined.
- Cylinder Heads: High-performance aluminum cylinder heads.
- Compression Ratio: Street performance compression profile.
- Bore & Stroke: 4.030 inch bore x 3.400 inch stroke (347 CID / 5.7L).
- Rotating Assembly: Externally balanced 28 oz imbalance with a hydraulic roller camshaft.
Component Breakdown: Base Long Block Configuration
This assembled base long block provides a powerful foundation for high performance engine swaps and direct repowers.
- A precision machined cast iron block houses a robust hydraulic roller camshaft designed to deliver a broad torque curve for heavy street applications.
- Lightweight aluminum cylinder heads improve overall thermal efficiency while heavy duty internal bearings maintain steady oil pressure under load.
Vehicle Fitment & Compatibility Matrix
Designed to drop seamlessly into the factory engine bay this 5.7L stroker aligns perfectly with standard Ford motor mounts. Utilizing one of our custom built stroked short blocks bypasses complex internal engine assembly entirely.
- Fits 1965-1973 Ford Mustang models acting as a direct fit performance replacement.
- Fits 1966-1977 Ford Bronco chassis replacing tired factory blocks perfectly.
- Fits 1967-1973 Mercury Cougar platforms looking for aggressive street power.
- Fits classic Ford F-100 pickup trucks updating the original powertrain with a fresh block.
Fuel & Ignition System Requirements
Feeding this modern aluminum headed stroker engine demands proper fuel tuning and reliable ignition components.
- An upgraded high pressure mechanical or electronic fuel pump is required to supply the carburetor while utilizing 91 Octane premium pump gas prevents pre-ignition under load.
- Heavy duty spark plug wires must be utilized alongside an aftermarket distributor to maintain a powerful spark across the RPM band.
Installation, Break-In Oil & Priming Instructions
Proper initial startup procedures ensure the longevity of the hydraulic roller lifters and internal bearings.
- Transfer your existing intake manifold using fresh gaskets before manually priming the oil system with a dedicated Windsor priming tool.
- Fill the crankcase with a high zinc break in oil and perform a varied RPM heat cycle before driving conservatively for the first 500 miles.
USA Warranty, Emissions & Logistics
Investing in this ATK High Performance crate engine secures peace of mind through comprehensive manufacturer backing.
- Backed by a strict 1-Year manufacturer warranty this engine provides excellent protection against internal manufacturing defects when installed properly.
- This assembly is not legal for sale or use on pollution controlled motor vehicles in California and ships securely via LTL freight.
ATK High Performance HP20 Ford 347 Stroker 410 HP Stage 1 LB Specs
| Brand | ATK High Performance Engines |
| Part Type | Crate Engines |
| Product Line | ATK High Performance Ford 347 Stroker 410 HP Stage 1 Long Block Crate Engines |
| UPC | 00653517137532 |
| Crate Engine Family | Ford Windsor |
| Actual Engine Displacement | 5.7L/347 |
| Crate Engine Cylinder Head Material | Aluminum |
| Engine Block Material | Cast iron |
| Assembled | Yes |
| Engine Balance | External, 28 oz. imbalance |
| Cam Style | Hydraulic roller, OE roller |
| Rear Main Seal Style | 1-piece |
| Intake Manifold Included | No |
| Cylinder Heads Included | Yes |
| Carburetor Included | No |
| Throttle Body Included | No |
| Distributor Included | No |
| Oil Pan Included | Yes |
| Valve Covers Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | No |
| Harmonic Balancer Included | Yes |
| Flexplate Included | No |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
| Supercharger Included | No |
| Warranty Information | 1 Year |
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