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ATK Ford 408 Stroker 430 HP HP21M Stage 2 Mid-Dress LB
High-nickel iron makes the ATK Ford 408 430HP a rigid platform. This internally balanced 6.7L stroker features aluminum heads and a 10.0:1 squeeze. Top it with your carburetor. Launch hard.
- Internally balanced crank survives high revs
- Included intake manifold saves bench time
- Hydraulic roller cam ramps up torque
- Aluminum heads dissipate chamber heat fast
Description
The massive internal displacement of the ATK Ford 408 Stroker 430 HP HP21M Stage 2 Mid-Dress LB delivers commanding highway passing power. Accelerate high-horsepower restomod projects with pre-installed induction hardware. This build utilizes a durable cast iron block to anchor moderate performance upgrades reliably.
Key Features of ATK Ford 408 Stroker 430 HP HP21M
- Block Material: Cast iron Ford Windsor Small Block resists thermal fatigue and provides a stable foundation for the internally balanced rotating assembly.
- Cylinder Heads: High-performance aluminum cylinder heads manage intense combustion temperatures effectively while reducing front end weight.
- Compression Ratio: A 10.0:1 advertised compression ratio ensures crisp throttle response and massive mid range torque.
- Rotating Assembly: An internally balanced rotating assembly paired with a hydraulic roller camshaft guarantees smooth power delivery at high RPMs.
Component Breakdown: Mid-Dress Performance Long Block
This partially assembled engine accelerates your powertrain swap project by including major induction hardware pre-installed.
- A matched carbureted intake manifold pairs with the included distributor and harmonic balancer to simplify front drive integration immediately out of the crate.
- Heavy duty aluminum cylinder heads resist thermal fatigue while the pre-installed oil pan and flexplate streamline the bottom end installation securely.
Vehicle Fitment & Compatibility Matrix
Engineered as a comprehensive powertrain solution this mid-dress Windsor engine drops effortlessly into iconic Ford muscle cars. Sourcing one of our heavy-duty Ford stroker crate engines bypasses complex machine shop delays.
- Fits 1969-1973 Ford Mustang models replacing tired small blocks perfectly.
- Fits 1980-1996 Ford Bronco platforms seeking massive low end torque upgrades.
- Fits 1969-1973 Mercury Cougar chassis acting as a direct fit performance replacement.
- Fits classic Ford F-100 pickup trucks looking for aggressive towing and street power.
Fuel & Ignition System Requirements
Proper fuel delivery dictates the final performance output of this carbureted platform.
- A high flow 750 CFM carburetor is required to supply the intake manifold while utilizing 91 Octane premium pump gas prevents pre-ignition under load.
- The included distributor mandates a direct twelve volt ignition source bypassing factory resistor wires to guarantee a powerful spark.
Installation, Break-In Oil & Priming Instructions
Professional mechanical preparation separates a successful engine build from a catastrophic premature failure.
- Fill the crankcase with a high zinc break in oil before manually priming the oil system with a dedicated priming tool until pressure is verified.
- Perform a varied RPM heat cycle before changing the oil and 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.
- Designated strictly for Race Use Only on non-pollution controlled motor vehicles this package ships securely via LTL freight.
ATK High Performance Ford 408 Stroker 430 HP Stage 2 Long Block Crate Engines HP21M Specs
| Brand | ATK High Performance Engines |
|---|---|
| Manufacturer's Part Number | HP21M |
| Part Type | Crate Engines |
| Product Line | ATK High Performance Ford 408 Stroker 430 HP Stage 2 Long Block Crate Engines |
| Summit Racing Part Number | HPE-HP21M |
| UPC | 00653517260117 |
| Crate Engine Family | Ford Windsor |
| Actual Engine Displacement | 6.7L/408 |
| Crate Engine Cylinder Head Material | Aluminum |
| Engine Block Material | Cast iron |
| Advertised Compression Ratio | 10.0:1 |
| Assembled | Yes |
| Engine Balance | Internal |
| Cam Style | Hydraulic roller, OE roller |
| Rear Main Seal Style | 1-piece |
| Intake Manifold Included | Yes |
| Intake Manifold Style | Carbureted |
| Cylinder Heads Included | Yes |
| Carburetor Included | No |
| Throttle Body Included | No |
| Distributor Included | Yes |
| Oil Pan Included | Yes |
| Valve Covers Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | Yes |
| Harmonic Balancer Included | Yes |
| Flexplate Included | Yes |
| 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 |
| Quantity | Sold individually. |
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