ATK Ford 302 350 HP HP78 Stage 1 High-Output Engine

ATK Ford 302 – Windsor High-Output Application

The ATK Ford 302 350 HP HP78 Stage 1 High-Output Engine resolves the thermal and airflow bottlenecks inherent in factory 5.0L iron-head Windsor platforms. By utilizing high-velocity aluminum cylinder heads with a performance-profile hydraulic roller camshaft, this unit solves the high-RPM power fade common in stock builds. The 302ci configuration provides optimized volumetric efficiency, allowing the small block Ford architecture to manage consistent cylinder pressures during aggressive street performance or competitive circuit cycles.

Integrating this professionally assembled long block provides a significant advantage by bypassing the risks of junkyard core rebuilds and mismatched valvetrain geometry. Selecting this HP78 package saves over 52 hours of specialized shop labor through its precision internal balancing and pre-installed aluminum head assembly. This dyno-ready foundation ensures 350 HP consistency, offering shop owners a dependable 5.0L solution that significantly reduces the potential for catastrophic failure during initial high-load tuning and engine break-in.

ATK High Performance HP78 Engineering Specifications

• The reciprocating assembly features a 5.0L by 302 cubic inch displacement profile
• Peak performance reaches 350 HP output with high torque capacity
• Internal compression is set at Stage 1 ratios for 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 broader RPM window than legacy Ford small blocks. This modification improves instantaneous throttle response sensitivity, making the platform highly responsive for classic Mustang or early Bronco swaps. Under hydraulic roller control, the BMEP remains stable, preventing detonation during rapid acceleration events in high-performance environments while maintaining linear power delivery to the 350 HP peak.

Material Integrity & Ford Windsor Durability

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

HP78 Drivetrain & Ford Windsor Integration

This long block interfaces with Ford transmissions via a 1-piece rear main seal and Windsor-specific bolt patterns. Because the assembly uses a 50 oz. external imbalance, builders must ensure the harmonic balancer and weighted flexplate are used. This prevents destructive torsional vibrations that could damage sensitive drivetrain bearings or the transmission input shaft during high-RPM street-strip operations or heavy-duty Ford truck swaps.

Ford 302 Street & Swap Versatility

This 302ci unit is a primary choice for Mustang restorations, Bronco conversions, and classic F-series truck swaps. It maintains a safe compression safety margin, allowing for worry-free operation on standard 91 octane pump fuel. The performance hydraulic roller valvetrain ensures smooth idle quality and AFR stability, making 350 HP manageable in heavy traffic or during long-distance highway cruising.

Fitment & Ford 302 Installation Protocol

Builders must confirm chassis clearance for the provided Ford oil pan and aluminum head castings. The protocol demands verifying the fuel pump flow to support the 350 HP peak output potential. Check accessory drive alignment against the provided timing cover. Professional priming of the lubrication system is mandatory before the first Windsor ignition to ensure initial bearing protection and valvetrain longevity.

Warranty & Support Compliance

ATK High Performance stands behind this 5.0L build with a limited **24-month warranty** against defects in workmanship. Claims require valid proof of professional installation and a completed warranty registration form. US-based tech support provides startup and break-in guidance to safeguard this significant mechanical investment during the critical first 500 miles of vehicle operation.

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