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ATK Ford 302 350 HP HP78 Stage 1 High-Output Engine
Forget chasing vacuum leaks; the bare-bones ATK High Performance HP78 Ford 302 supplies 350 horsepower from a Stage 1 foundation, letting builders customize the intake and ignition systems.
- 350 horsepower upgrades stock Windsor performance drastically
- Aluminum cylinder heads cool intake charges efficiently
- Stage 1 foundation allows extreme builder customization
Description
Preventing restrictive volumetric efficiency requires the ATK Ford 302 350 HP HP78 Stage 1 High-Output Engine and its lightweight aluminum head castings. Secure consistent thermal efficiency during demanding canyon carving sessions. This build utilizes a robust hydraulic roller valvetrain to increase airflow capacity safely.
Engine Architecture & Core Specifications
- Block Material: Cast iron Ford Windsor Small Block.
- Cylinder Heads: High-performance aluminum cylinder heads.
- Compression Ratio: Custom compression profile tailored for street performance.
- Bore & Stroke: 4.000 inch bore x 3.000 inch stroke (302 CID / 5.0L).
- Rotating Assembly: Externally balanced 50 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 5.0L block aligns perfectly with standard Ford motor mounts. Utilizing one of our custom built Ford 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 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 24-Month or Unlimited-Mile 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 HP78 Ford 302 350 HP Stage 1 Long Block Specs
| Brand | ATK High Performance Engines |
| Part Type | Crate Engines |
| Product Line | ATK High Performance Ford 302 350 HP Stage 1 Long Block Crate Engines |
| UPC | 00653517225772 |
| Crate Engine Family | Ford Windsor |
| Actual Engine Displacement | 5.0L/302 |
| Crate Engine Cylinder Head Material | Aluminum |
| Engine Block Material | Cast iron |
| Assembled | Yes |
| Engine Balance | External, 50 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 | No |
| 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 |
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