ATK Ford 302 365 HP HP78C-EFI Stage 3 EFI Engine

ATK Ford 302 – Windsor Street-Strip Application

The ATK Ford 302 365 HP HP78C-EFI Stage 3 EFI Engine eliminates the fueling and airflow bottlenecks inherent in legacy factory 5.0L Windsor platforms. By pairing high-velocity aluminum cylinder heads with a digital EFI management system, this Stage 3 unit solves the cold-start and altitude tuning issues common in carbureted builds. The 302ci configuration provides optimized volumetric efficiency under EFI, allowing for precise ignition timing and consistent cylinder pressure management during aggressive street performance or track-day cycles.

Integrating this professionally mapped EFI architecture delivers massive ROI by removing the variable costs of independent fuel system calibration and ECU wiring. Choosing this HP78C-EFI package saves approximately 62 hours of shop labor through its plug-and-play wiring harness and pre-configured computer system. This dyno-ready foundation ensures 365 HP consistency, offering shop owners a dependable 5.0L solution that significantly reduces the threat of component fatigue during the initial startup and engine break-in phase.

ATK High Performance HP78C-EFI Engineering Specifications

• The reciprocating assembly features a 5.0L by 302 cubic inch displacement profile
• Peak performance reaches 365 HP output with extreme torque capacity
• Internal compression is set at 9.5:1 for optimal thermal efficiency
• Rotating components consist of high-tensile cast materials to maintain stability
• Cylinder head architecture utilizes aluminum for superior heat dissipation
• The block foundation uses cast iron to prevent cylinder wall distortion
• Valvetrain configuration follows hydraulic roller standards to ensure timing control

Ford 302 Power & BMEP Characteristics

The 302 cubic inch stroke anchors the torque peak in a usable street-friendly RPM window. This modification improves the instantaneous throttle response sensitivity, making the platform highly responsive for classic Mustang or Fox-body EFI swaps. Under electronic management, the BMEP remains stable, preventing detonation during rapid acceleration events in high-performance environments while maintaining precise fuel delivery curves through the throttle body.

Material Integrity & Ford Windsor Durability

Durability is engineered through the combination of a high-rigidity iron block and lightweight aluminum heads. This construction eliminates thermal fatigue risks common in legacy all-iron engines when subjected to sustained heavy loads. The external 50 oz. balancing process removes stress risers from the crankshaft, ensuring survival through extreme heat cycles typical of high-performance Ford muscle car restorations where structural integrity is a mandatory requirement.

HP78C-EFI Drivetrain & Ford Windsor Integration

This engine bolts directly to Ford transmissions utilizing a 1-piece rear main seal and Windsor-specific bolt patterns. Because the assembly uses a 50 oz. external imbalance, builders must ensure the included harmonic balancer and flexplate are installed. This prevents destructive torsional vibrations that could damage sensitive drivetrain bearings. The provided harness and sensors simplify integration with modern overdrive transmissions for improved cruising efficiency.

Ford 302 Street & Swap Versatility

This 302ci unit is a primary choice for Mustang restorations, Bronco conversions, and classic F-100 truck swaps. It maintains a 9.5:1 compression safety margin, allowing for worry-free operation on standard 91 octane pump fuel. The integrated EFI system ensures smooth idle quality and AFR stability, making 365 HP manageable in heavy traffic or during long-distance highway cruising without the maintenance of carburetors.

Fitment & Ford 302 Installation Protocol

Builders must confirm chassis clearance for the provided Ford oil pan and intake manifold height. The protocol requires routing the provided engine harness to the onboard computer to support the 365 HP peak potential. Check accessory drive alignment against the provided water pump and timing cover. Professional priming of the lubrication system is mandatory before the first electronic ignition to protect the main bearings.

Warranty & Support Compliance

ATK High Performance stands behind this complete EFI build with a limited **12-month warranty** against defects in workmanship. Claims require documented professional installation and a completed warranty registration form. US-based tech support provides EFI calibration and startup guidance to safeguard this significant mechanical investment during the critical first 500 miles of operation.

Final installation and chassis compatibility must be verified against manufacturer’s current technical bulletin and vehicle-specific measurements.