ATK Engines Long Block Assembly (MPN: HP73)

High performance engine with 320 horsepower and durable components.

The ATK Engines Long Block Assembly is engineered for maximum performance and long-term durability, making it suitable for a variety of applications including street performance and racing. This assembly features a robust design with a 9:1 compression ratio, delivering 320 horsepower and 415 foot-pounds of torque. The engine is built with seasoned OE Magnum block and cylinder heads, ensuring reliability and strength under demanding conditions.

Incorporating high-quality components such as hypereutectic dished pistons, moly rings, and a hydraulic roller camshaft, this engine assembly is designed to provide optimal performance. The externally balanced configuration and cast iron construction of both the cylinder block and heads contribute to the overall stability and efficiency of the engine. Additionally, the inclusion of steel rocker arms and a double roller timing chain enhances the engine's performance capabilities.

ATK Engines has a legacy of over 80 years in engine building, offering products that are trusted by enthusiasts and professionals alike. This long block assembly is a testament to their commitment to quality and performance, making it a reliable choice for those seeking to enhance their vehicle's power output.

Features

• Provides Maximum Performance And Long-Term Durability
• ATK High Performance Engines Are Based On Dyno Proven Combinations Built With Name Brand Parts
• Features Hypereutectic Pistons And Moly Rings
• Features OE Cast Crankshaft
• Features Hydraulic Roller Camshaft
• Features Double Roller Timing Chain
• Features Cast Iron Cylinder Head
• Features Steel Rocker Arms

Specifications

• Manufacturer: ATK Performance Eng.
• Manufacturer Part Number: HP73
• Engine Compatibility: Mopar Small Block Magnum
• Recommended Use: Street Performance
• Horse Power Output: 320 Horsepower
• Torque Output: 415 Feet Pound
• Bore (IN): 4.04 Inch
• Stroke (IN): 3.58 Inch
• Compression Ratio: 9.0:1
• Color: Black/ Silver
• Cylinder Block Material: Cast Iron
• Cylinder Head Material: Cast Iron
• Balanced Type: Externally Balanced
• Includes Camshaft: Yes
• Includes Fuel Pump: Yes
• Includes Oil Pan: Yes
• Includes Water Pump: No
• Includes Intake Manifold: No
• Includes Carburetor: No
• Includes Air Cleaner: No
• Includes Distributor: No
• Marine: No

Compatibility / Fit

• 1977-1980 Chrysler New Yorker
• 1971-1972 Chrysler Newport
• 1974-1980 Chrysler Newport
• 1976-1978 Dodge B100
• 1971-1974 Dodge B100 Van
• 1998-1998 Dodge B1500
• 1975-1980 Dodge B200
• 1971-1973 Dodge B200 Van
• 1981-1981 Dodge B250
• 1984-1994 Dodge B250
• 1995-1998 Dodge B2500
• 1971-1974 Dodge Challenger
• 1975-1978 Dodge Charger
• 1971-1976 Dodge Coronet
• 1975-1979 Dodge D100
• 1986-1988 Dodge D100
• 1971-1974 Dodge D100 Pickup
• 1975-1980 Dodge D200
• 1971-1974 Dodge D200 Pickup
• 1981-1982 Dodge D250
• 1984-1993 Dodge D250
• 1971-1974 Dodge Dart
• 1978-1979 Dodge Magnum
• 1980-1980 Dodge Mirada
• 1971-1974 Dodge Monaco
• 1972-1973 Dodge Polara
• 1974-1981 Dodge Ramcharger
• 1984-1988 Dodge Ramcharger
• 1975-1977 Dodge Royal Monaco
• 1975-1977 Dodge W100
• 1986-1988 Dodge W100
• 1972-1974 Dodge W100 Pickup
• 1977-1981 Dodge W150
• 1984-1991 Dodge W150
• 1993-1993 Dodge W150
• 1975-1980 Dodge W200
• 1971-1974 Dodge W200 Pickup
• 1981-1982 Dodge W250
• 1984-1993 Dodge W250
• 1971-1974 Plymouth Barracuda
• 1971-1974 Plymouth Cuda
• 1974-1976 Plymouth Duster
• 1971-1978 Plymouth Fury
• 1971-1974 Plymouth Fury I
• 1971-1974 Plymouth Fury II
• 1971-1974 Plymouth Fury III
• 1972-1977 Plymouth Gran Fury
• 1980-1980 Plymouth Gran Fury
• 1976-1978 Plymouth PB100
• 1974-1974 Plymouth PB100 Van
• 1975-1980 Plymouth PB200
• 1974-1974 Plymouth PB200 Van
• 1981-1981 Plymouth PB250
• 1974-1975 Plymouth Road Runner
• 1971-1974 Plymouth Satellite
• 1975-1981 Plymouth Trailduster
• 1971-1974 Plymouth Valiant
• 1976-1976 Plymouth Valiant
• 1976-1980 Plymouth Volare

Technical Documents

• ATK_Warranty.pdf