Item # 22621 BRAND: ATK Engines

ATK Chrysler 360 Magnum Engine 320HP Complete HP73C

HP73C ATK Chrysler 360 Magnum Complete Engine Long Block Price Includes $370 Core Charge
HP73C ATK Chrysler 360 Magnum Complete Engine Long Block Price Includes $370 Core Charge
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HP73C ATK Chrysler 360 Magnum Complete Engine Long Block Price Includes $370 Core Charge

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ATK Chrysler 360 Magnum Engine 320HP Complete HP73C

Product Overview:

Description

If you are looking for smooth performance and good boost, then the ATK HP73C Chrysler 360 Magnum Engine 290HP Complete is the one to choose. It is designed with well-suited components to perform at its peak without setbacks. 320 horsepower combined with amazing 410 ft.lb torque makes this crate engine a perfect addition to a street cruiser.

Engine Specifications:

  • Horsepower: 320
  • Torque: 410 lbs./ft.
  • Block: Seasoned OE Magnum
  • Bore/Stroke: 4.040 x 3.580
  • Displacement: 360 C.I.D.
  • Crankshaft: OE Cast 3.580" Externally Balanced
  • Connecting Rods: OE Steel Rod 6.123" Stock Bolts
  • Pistons: Hypereutectic Dished
  • Piston Rings: Moly Rings
  • Compression Ratio: 10.1:1 Compression
  • Camshaft: Hydraulic Roller
  • Camshaft Specifications: Stock Magnum Grind
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Cylinder Heads: Magnum 65cc 1.78/1.50
  • Freeze Plugs: Brass Installed & Sealed
  • Rocker Arms: Steel 1.6 Pedestal
  • Oil Galley Plugs: Installed & Sealed
  • Oil Pan: OE 5qt.
  • Weight: 430

ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.



Don't forget the engine paint!
Engine Paint

Warranty

Click Here for Warranty Information

Specifications

Engine Information:

• Oil: 10W30
• Oil Filter: Wix or K&N Recommended Per Your Application
• Fuel Delivery: Quick Fuel Carburetor 680cfm #HR-680-VS
• Intake Manifold: Edelbrock Performer RPM Air-Gap Dual Plane #7577
• Spark Plugs: Autolite #3923
• Spark Plug Gap: .035"
• Harmonic Balancer/Damper: POWERBOND Externally Balanced #PB1186-N
• Flex Plate / Flywheel: Pioneer Flex Plate #FRA-478 (requires Ext. Balance Converter)
• Timing: 34-36 Degrees Total
• Water Pump: Stock
• Firing Order: 1 8 4 3 6 5 7 2
• Exhuast: 1 5/8 Headers
• Fuel Pump: Holley 110GPH Mechanical Fuel Pump
• Fuel: 87 Octane
• Ignition: MSD Pro Billet #8388
• Automatic Transmission Stall Converter: Stock (If using a Neutral Balance Converter, you need to use a B&M Flex Plate #10242 (externally balanced)

Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.

Shipping & Handling

Shipping is free and lift gate will be provided.

In the Box

Contents

ATK High Performance Chrysler 360 Magnum 320 HP Stage 3 Long Block Crate Engines

Guides & Accessories

Reviews

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Questions & Answers

what would I need to do for swapping my slant 6 to this in a 67 barracuda?

Asked by: cuda
We apologize for the confusion and inconvenience. We would have to advise you to speak directly to the manufacturer as these items drop ship. They can be reached by calling 866-721-2315.
Answered by: Kelly H
Date published: 2021-08-12

Will this work in my 71 plymouth cuda with 4-speed?

Asked by: cudaguy71
We apologize for the confusion and inconvenience. We would have to advise you to speak directly to the manufacturer as these items drop ship. They can be reached by calling 866-721-2315.
Answered by: Kelly H
Date published: 2021-08-12

Would this work for a 1979 Dodge b300 sportsman?

Asked by: cborchardt82
We apologize for the confusion and inconvenience. We would have to advise you to speak directly to the manufacturer as these items drop ship. They can be reached by calling 866-721-2315.
Answered by: Kelly H
Date published: 2021-08-12

I have a 1996 ram 1500 that is EFI that came stock with the 5.2 Magnum, will this fit my truck? 

Asked by: Anonymous
We apologize for the confusion and inconvenience. We would have to advise you to speak directly to the manufacturer as these items drop ship. They can be reached by calling 866-721-2315.
Answered by: Caleb M
Date published: 2021-08-06

Will this bolt into my 1986 dodge ram d150 2wd. With stock transmission flex plate and convertor. Came with a 318 2bbl.

Asked by: Neil
the magnum engines are balanced differently then the 318's. ATK reccomends the magnum engines are balanced differently then the 318's. ATK reccomends Flex Plate / Flywheel: Pioneer Flex Plate #FRA-478 (requires Ext. Balance Converter) or Automatic Transmission Stall Converter: Stock (If using a Neutral Balance Converter, you need to use a B&M Flex Plate #10242 (externally balanced)
Answered by: Bob G
Date published: 2020-08-26

I have 99 ram 1500 with a 318 ci ,I want to go with this engine, My truck is a 4 x 4 with fuel injection EFI, I see that this engine is carburetor how much would it take to switch it to EFI and boost performance for More horsepower.

Asked by: Moparman66
The HP73C would not work in his truck and we do not offer a performance option that will, unfortunately.
Answered by: ZachC
Date published: 2019-12-31

Could this motor mount easily to my 67 Barracuda with a 727 torque flight auto tranny?

Asked by: Keven
Yes it can but please be aware that this is an externally balanced motor and requires an externally balanced flex plate/ converter combo.
Answered by: Kelly H
Date published: 2021-03-01

Will this engine fit 1978 cj5?

Asked by: Tim58
this engine is not easily adaptable to a 1978 CJ5
Answered by: Bob G
Date published: 2019-10-07
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ATK Chrysler 360 Magnum Engine 320HP Complete HP73C
$7,752.00
In Stock