Engine Timing Set Guide for the 1970-1975 Dodge Challenger

The Critical Flaw in Your Original Timing Set

If your 1970-1975 Challenger still has its original timing set, it is a ticking time bomb. From the factory, Chrysler used camshaft gears with nylon-coated aluminum teeth to make the engine run quieter. After decades of heat cycles and exposure to engine oil, this nylon becomes brittle, cracks, and breaks off. This can cause the timing chain to slip, jump a tooth, or fail completely, leading to bent valves and destroyed pistons. The broken nylon pieces can also clog the oil pump pickup screen, starving the engine of oil and causing widespread failure. For this reason, replacing the original timing set with an all-metal aftermarket version is one of the most important reliability upgrades you can make.

Symptoms of a Failing Timing Set

A worn or stretched timing chain will give you several warning signs before it fails completely.

• Engine Rattle: The most common symptom is a rattling or scraping sound from the front of the engine, especially noticeable at idle or on cold starts. It can sound like a bicycle chain dragging inside the timing cover.
• Poor Engine Performance: As the chain stretches, it retards the camshaft timing. This results in hard starting, a rough idle, stumbling when you accelerate, and a general loss of power.
• Inconsistent Ignition Timing: If you check your ignition timing with a timing light, a stretched chain will cause the timing mark on the harmonic balancer to jump around erratically instead of holding steady.
🎬 Watch: How to check your timing chain in five minutes.
• Metal or Plastic in Oil: When changing your oil, finding chunks of plastic (from the original gear) or metal shavings in the drained oil or oil filter 🎬 See a breakdown of the top 5 timing chain symptoms. is a definite sign of a failing timing set.

Choosing the Right Aftermarket Timing Set

All aftermarket timing sets are an upgrade over the original nylon-toothed gear. The best choice for your Challenger depends on your engine and how you use the car. Timing sets are specific to your engine family (Small Block vs. Big Block), so ensure you order the correct one.

Standard & Stock Replacement (Good)

For a stock or mildly modified engine used for daily driving or cruising, a standard replacement set is an excellent and affordable choice. These kits are a massive improvement over the factory parts.

• Brands: Cloyes (Standard), Melling, INA
• Features: These kits typically feature an all-metal construction with either a "silent" type chain (similar to OEM but more durable) or a single roller chain for improved strength. They are reliable and will last for many tens of thousands of miles in a stock application.

Heavy-Duty & Performance (Better & Best)

For high-performance engines, rebuilt motors, or for maximum durability, a heavy-duty timing set is the best option. These are built to handle higher RPMs and increased stress from performance camshafts.

• Brands: Edelbrock, Melling Select Performance, Cloyes (Race Billet/True Roller)
• Features: The key upgrade here is a double roller chain. This type of chain is significantly stronger and more resistant to stretching than a single roller or silent chain. The sprockets are often machined from billet steel for superior strength and precision compared to cast gears. Many performance sets also offer multiple keyways on the crankshaft sprocket, allowing a builder to advance or retard cam timing to fine-tune the engine's power band.
🎬 Watch: Step-by-step guide to installing a new timing set.

Estimated Costs for Timing Set Replacement

Cost estimates are for parts and labor and can vary based on your location and the specific parts chosen.

Frequently Asked Questions