ATK Mopar 360 Magnum 320 HP HP73C-EFI Stage 3 EFI Engine

Description

The completely assembled electronic fuel injection system on the ATK Mopar 360 Magnum 320 HP HP73C-EFI Stage 3 EFI Engine modernizes classic Chrysler powertrains instantly. Maintain flawless throttle response and crisp cold starts during intense street driving. This turn-key build utilizes high-flowing cast iron cylinder heads to output 320 HP smoothly.

Key Features of ATK Mopar 360 Magnum 320 HP HP73C-EFI

• Block Material: Cast iron Mopar Small Block Magnum prevents structural flexing to harness massive mid-range torque safely.
• Cylinder Heads: High-performance cast iron cylinder heads feature advanced port designs to maximize volumetric efficiency.
• Compression Ratio: A 9.0:1 advertised compression ratio optimizes power output while remaining completely safe for premium pump gas.
• Bore & Stroke: The 5.9L internal displacement guarantees aggressive tire shredding torque right off the line.
• Fuel Delivery: The pre-installed fuel injection system delivers precise air and fuel mixtures for unmatched drivability and reliability.
• Engine Management Computer & Harness: Delivers immediate turnkey starting capabilities right out of the crate without complex tuning.

Component Breakdown: Turn-Key Complete EFI Engine

This complete engine package arrives fully dressed from the intake manifold to the oil pan to eliminate sourcing individual modern accessories.

• A high flow throttle body sits atop a matched electronic fuel injection manifold while the included computer and wiring harness ensure immediate ignition out of the crate.
• A factory style water pump and harmonic balancer complete the front drive assembly allowing builders to focus on chassis installation.

Vehicle Fitment & Compatibility Matrix

Designed for classic Dodge and Chrysler restomod projects this complete EFI engine drops perfectly into vintage chassis. Sourcing one of our turn-key Mopar EFI crate engines modernizes your classic restoration instantly.

• Fits 1970-1974 Dodge Challenger models looking for an instant fuel-injected powertrain swap.
• Fits 1968-1974 Dodge Charger platforms requiring a reliable and modern EFI setup.
• Fits 1970-1976 Plymouth Duster applications needing a reliable V8 foundation.
• Fits classic Dodge D100 pickup truck conversions requiring a 360 Magnum drop-in setup.

Fuel & Ignition System Requirements

Supplying adequate fuel pressure to this EFI Mopar platform requires capable modern supporting hardware.

• An upgraded high pressure electronic fuel pump is required to supply the fuel injection system while utilizing 91 Octane premium pump gas prevents pre-ignition under load.
• The pre-installed distributor and spark plug wires mandate a clean 12-volt power source directly from the battery to guarantee a powerful spark.

Installation, Break-In Oil & Priming Instructions

Executing a flawless installation demands meticulous attention to fluid dynamics and proper heat cycling.

• Before firing the engine builders must utilize a specialized tool to prime the oiling system manually ensuring fluid reaches the upper valvetrain completely.
• Fill the engine with a premium high zinc break in oil and perform a careful initial startup monitoring for leaks before executing a 500 mile break in period.

USA Warranty, Emissions & Logistics

Protecting your investment requires understanding the specific logistics and legal compliance associated with this purchase.

• Backed by a strict 24-Month / Unlimited-Mile manufacturer warranty this complete long block offers extensive coverage against assembly defects.
• This non-emissions compliant engine is designated for pre-emissions or off road Race Use Only and requires freight delivery to a commercial address with a forklift.