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Engine Parts

318 Long Block Crate Engine: A Comprehensive Guide

May 14, 2025

Explore the power, versatility, and enduring appeal of the 318 long block crate engine in this comprehensive guide. Learn about its specifications, applications, installation tips, and maintenance practices.

The 318 long block crate engine is a notable choice for car enthusiasts, mechanics, and anyone looking to restore or upgrade vehicles, especially classic Mopar models. Its blend of reliability, power, and affordability makes it a sought-after engine in various automotive projects. This comprehensive guide will delve into the history, specifications, applications, advantages, selection process, installation tips, and maintenance requirements for the 318 long block crate engine. We will also explore the potential upgrades and modifications to maximize its performance.

 

What is a 318 Long Block Crate Engine?

A 318 long block crate engine is a complete, fully assembled engine that includes the engine block, rotating assembly (crankshaft, connecting rods, and pistons), cylinder heads, camshaft, timing components, and valve train. However, it excludes external accessories such as the intake manifold, carburetor, fuel injectors, alternator, and exhaust components. This makes it a nearly complete engine package that can be installed directly into a vehicle after adding necessary external components.

The '318' refers to the engine's displacement in cubic inches, equivalent to 5.2 liters. It is a V8 engine originally produced by Chrysler and widely used in Dodge, Plymouth, and Chrysler vehicles. This engine is recognized for its balanced performance, making it a popular choice for both daily drivers and high-performance builds.

 

History and Evolution of the 318 Engine

The 318 engine was first introduced by Chrysler in 1967 as part of the LA (Lightweight A) engine series. It was designed to be a compact, lightweight, and efficient engine, featuring a cast iron block and heads, overhead valve (OHV) configuration, and a relatively small bore and stroke ratio.

Over the years, the 318 engine evolved to include electronic ignition systems, improved cylinder heads, and enhanced cooling capabilities. By the 1980s, Chrysler introduced electronic fuel injection (EFI) to the 318, significantly improving fuel economy and reducing emissions. In 1985, the engine received a hydraulic roller camshaft, which further increased its power output and efficiency.

Despite being overshadowed by more powerful engines like the 340 and 360, the 318 remained a staple in Chryslers lineup due to its durability and ease of maintenance. Today, it is widely used in restorations, hot rods, and off-road vehicles due to its reliable construction and availability of aftermarket parts.

 

Specifications of the 318 Long Block Crate Engine

The specifications of the 318 long block crate engine can vary depending on the manufacturer, intended use, and specific build. However, the following are typical specifications for a standard 318 engine:

  • Engine Type: V8, OHV (Overhead Valve) configuration with a 90-degree V angle
  • Displacement: 318 cubic inches (5.2 liters)
  • Bore and Stroke: 3.91 inches x 3.31 inches
  • Compression Ratio: 8.5:1 to 9.2:1, with variations based on the camshaft and piston selection
  • Horsepower Output: Ranges from 230 to 300 horsepower, depending on modifications and components used
  • Torque Output: Approximately 300 to 350 lb-ft of torque
  • Fuel Delivery: Carbureted or Electronic Fuel Injection (EFI), with EFI providing improved fuel efficiency and throttle response
  • Camshaft Type: Hydraulic flat tappet or hydraulic roller camshaft
  • Cylinder Heads: Cast iron or aluminum, with varying valve sizes and port configurations
  • Ignition System: Electronic or points-based ignition system, depending on the era of production

 

Applications of the 318 Long Block Crate Engine

The 318 long block crate engine has a wide range of applications, making it a versatile choice for various automotive projects:

  • Classic Car Restorations: The 318 engine is a common choice for restoring classic Mopar vehicles, including Dodge Darts, Plymouth Barracudas, and Chrysler Valiants. Its compact size allows it to fit easily in most engine bays, and its robust construction ensures long-term reliability.
  • Off-Road and 4x4 Builds: Due to its solid torque output and simple design, the 318 is ideal for off-road trucks and 4x4 vehicles. Builders often modify the engine to handle extreme conditions, such as installing high-flow cylinder heads and heavy-duty camshafts.
  • Street and Strip Performance: With the right modifications, the 318 can be transformed into a powerful street or drag racing engine. Upgrading to a high-performance intake manifold, camshaft, and exhaust system can significantly increase horsepower and torque.
  • Work Vehicles and Trucks: The 318 engines durability makes it a reliable powerplant for work trucks, vans, and utility vehicles. Its ability to generate substantial low-end torque makes it suitable for hauling and towing applications.

 

Advantages of Choosing a 318 Long Block Crate Engine

Affordability: The 318 engine is relatively inexpensive compared to larger V8 engines, making it a cost-effective choice for budget-conscious builders.

Parts Availability: Due to its widespread use, parts for the 318 engine are readily available from various manufacturers and aftermarket suppliers.

Reliability: The 318 is known for its robust construction and long-lasting performance, even under heavy loads and extreme conditions.

Upgrade Potential: The engine can be easily modified with aftermarket components to increase power output, including performance camshafts, aluminum cylinder heads, and high-flow intake manifolds.

Compatibility: It can be installed in a wide range of Chrysler, Dodge, and Plymouth vehicles with minimal modifications.

 

How to Choose the Right 318 Long Block Crate Engine

Selecting the right 318 long block crate engine requires careful consideration of several factors:

Intended Application: Determine if the engine is for street use, off-road, racing, or towing. Different builds offer varying power levels and torque curves.

Compression Ratio: A higher compression ratio increases power output but requires high-octane fuel. Lower ratios are more suitable for daily drivers and work vehicles.

Fuel Delivery System: Choose between carburetion and EFI based on your performance goals and budget

Camshaft Profile: Select a camshaft that matches your intended application. A mild camshaft is ideal for daily driving, while a more aggressive profile enhances performance at higher RPMs.

Warranty and Support: Reputable manufacturers offer warranties, technical support, and detailed installation guides to ensure a successful build.

 

Installation Tips for a 318 Long Block Crate Engine

  • Pre-Installation Inspection: Inspect all components for damage, verify torque settings, and check for proper alignment.
  • Engine Bay Preparation: Clean the engine bay thoroughly and ensure all mounting points and connections are in good condition.
  • Proper Sealing: Use high-quality gaskets and sealants to prevent leaks and ensure optimal performance.
  • Torque Specifications: Follow the manufacturers torque specifications for bolts, especially those for the cylinder heads, main caps, and crankshaft.
  • Cooling System Setup: Ensure the radiator and cooling system are in good working order to prevent overheating.
  • Break-In Procedure: Follow the recommended break-in procedure to seat the piston rings and bearings properly.

 

Maintenance and Care for the 318 Long Block Crate Engine

Regular Oil Changes: Use high-quality engine oil and change it at regular intervals to protect internal components.

Cooling System Checks: Monitor coolant levels and inspect hoses for leaks.

Tune-Up Intervals: Replace spark plugs, ignition wires, and filters to maintain peak performance.

Monitoring for Leaks: Inspect for oil, coolant, and fuel leaks regularly to prevent potential engine damage.

 

Conclusion

The 318 long block crate engine remains a versatile and powerful option for automotive enthusiasts, from classic car restorations to high-performance builds. Understanding its specifications, applications, and maintenance requirements ensures you get the most out of this iconic engine. With the right components and proper care, the 318 can deliver exceptional performance, reliability, and longevity.

 

Read More:  A Complete Guide to Toyota 3.0 Long Block vs. Toyota 3.0 V6 Long Block

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