Dodge Mirada 1980-1983 Engine Timing Set Replacement Guide
Everything a Mirada owner needs to know about choosing the right new aftermarket timing set for your Slant-6 or V8 engine.
- Replacing the original nylon-toothed sprocket with an all-metal aftermarket set is a crucial reliability upgrade.
- For V8 engines, verify if you need a 1-bolt (stock) or 3-bolt (performance) cam sprocket before ordering.
- A double roller timing set is a highly recommended and affordable upgrade for improved durability on any engine.
- Always replace the timing cover gaskets and front crankshaft seal when replacing the timing set to prevent oil leaks.
Is it Time to Replace Your Mirada's Timing Set?
The timing chain in your 1980-1983 Dodge Mirada is a wear item. The original factory timing sets, particularly on the V8 engines, often used a camshaft sprocket with nylon-coated teeth to reduce noise. Over decades, this nylon can become brittle, break off, and fall into the oil pan, which can lead to a stretched or jumped timing chain. Even the all-metal chains on the Slant-6 will stretch over time. A stretched chain retards camshaft timing, which hurts performance and fuel economy. If the chain fails completely, your engine will stop running instantly.
Critical Failure Warning
While the Slant-6 and Mopar LA V8s (318, 360) are generally non-interference engines, meaning the valves are unlikely to hit the pistons if the chain breaks, a failed chain can still cause damage. The broken chain can whip around inside the timing cover or get jammed in the sprockets, potentially causing significant harm. Do not ignore the symptoms of a failing timing chain.
Choosing the Right Aftermarket Timing Set
When shopping for a new timing set, you'll find several options. For a daily driver, a standard replacement set is a good choice. For those seeking improved durability or performance, a double-roller chain set is a worthwhile upgrade. These are much stronger than the original "silent" link-style chains.
Brand Quality Tiers for Your Mirada
- OEM-Quality Replacements (Good): Brands like Melling and Cloyes' standard replacement lines offer reliable, budget-friendly options that meet or exceed original factory specs. They are an excellent choice for a stock restoration or daily driver. Melling has a long-standing reputation for quality OEM-style parts.
- Heavy-Duty & Performance (Better): Brands like Edelbrock and the premium lines from Cloyes and Melling offer significant upgrades. These kits often feature all-steel sprockets and a true double-roller chain, which is much more durable than the stock chain. These are ideal for enthusiasts, mild performance builds, or anyone wanting maximum longevity.
- Premium Performance (Best): For high-performance builds, brands like Melling Select Performance or premium billet steel sets from Cloyes offer the highest strength and precision. Many of these kits include multi-keyway sprockets, allowing for precise camshaft timing adjustments (advancing or retarding the cam) to optimize the engine's powerband.
Note: While INA is a known brand for timing components, search results primarily show applications for modern Chrysler engines, not the vintage engines found in the 1980-1983 Mirada.
Common Ordering Mistake: V8 Camshaft Bolts
When ordering a timing set for the 5.2L (318) or 5.9L (360) V8, you must know if your camshaft uses a single-bolt or three-bolt sprocket. Stock and most aftermarket replacement cams use a single-bolt design. High-performance and racing camshafts often use a three-bolt design for extra strength to handle higher valve spring pressures. Ordering the wrong set will stop your project cold. If you have the stock camshaft, you need a single-bolt set.
| Quality Tier | Typical Price Range | Best For |
|---|---|---|
| Standard Replacement | $35 - $70 | Stock engines, daily drivers |
| Heavy-Duty / Double Roller | $70 - $120 | Improved durability, mild performance |
| Premium / Billet Sets | $120 - $170+ | Performance builds, maximum strength |
Frequently Asked Questions
Do I need a single or double roller chain?
For a stock engine, a standard single "silent" chain is adequate. However, a double roller chain is a very common and recommended upgrade for both Slant-6 and V8 engines. It offers significantly more strength and durability for a modest increase in cost and is considered a wise investment while the engine is apart.
Should I replace the timing cover seal and gaskets?
Yes. You have to remove the timing cover to access the timing set. It is essential to replace the front crankshaft seal, the timing cover gasket, and the front portion of the oil pan gasket at the same time to prevent oil leaks. These are typically sold separately in a timing cover gasket set.
What is a multi-keyway sprocket?
Some performance timing sets come with a crankshaft sprocket that has multiple keyways. This allows the installer to set the camshaft timing straight up (stock), or slightly advanced or retarded. Advancing the cam can improve low-end torque, while retarding it can move the power band to a higher RPM range. For a stock engine, you will use the standard '0' or dot-to-dot alignment.
Do I need a timing chain tensioner?
The original Slant-6 and LA V8 engines did not come with a timing chain tensioner. While some builders have adapted tensioners from later model V6 engines, it is generally not considered necessary, especially when using a quality double roller chain that is installed with the proper tension. In fact, some forum users advise against using tensioners with double roller chains.
Technical Specifications
Engine Fitment: Chrysler 3.7L (225ci) Slant-6, 5.2L (318ci) LA V8, 5.9L (360ci) LA V8. Chain Types: Standard Link ('Silent' type), Double Roller. Sprocket Material: Cast Iron, Billet Steel. V8 Cam Sprocket Attachment: 1-Bolt (Standard) or 3-Bolt (Performance).
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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