Engine Timing Sets for the 1967-1977 Oldsmobile Cutlass Supreme
Keep your classic Olds V8 running strong by replacing its most critical wear components.
- The original nylon-toothed cam gear is a major failure point; replace it with an all-steel aftermarket set immediately.
- For stock engines, a quality standard replacement set from Cloyes or Melling is an excellent, reliable choice.
- Always replace the chain and both sprockets as a complete set to ensure proper function and longevity.
- If you hear a rattling noise from the front of your engine, stop driving and inspect the timing chain to avoid severe engine damage.
A Critical Weak Point on Original Oldsmobile V8s
If you are still running the original timing set in your 1967-1977 Cutlass Supreme, it's a ticking time bomb. General Motors originally used a camshaft sprocket with nylon-coated teeth to reduce engine noise. Over decades of heat and use, this nylon becomes brittle, cracks, and breaks off. These plastic chunks fall into the oil pan and can clog the oil pump pickup screen, starving your engine of oil and leading to catastrophic failure. All modern aftermarket replacements use all-metal sprockets to eliminate this problem permanently.
Choosing the Right Aftermarket Timing Set
When shopping for a new timing set, you'll see different types and brands. For your Cutlass Supreme, the choice comes down to your engine's setup and how you use the car.
Aftermarket Brand Tiers
| Tier | Brands | Description |
|---|---|---|
| Standard Replacement | INA, Cloyes (Standard), Melling (Stock) | These are high-quality sets perfect for a stock or near-stock engine. They often use a durable "silent" type chain and all-steel gears, providing a reliable, quiet, and long-lasting replacement for the failure-prone original. Many enthusiasts and mechanics trust these brands for daily drivers and standard rebuilds. |
| Heavy-Duty / Mild Performance | Cloyes (Street True Roller), Melling (High Performance) | For engines with mild performance upgrades like a new camshaft or carburetor, a true roller chain is a great step up. These sets feature a chain with actual rollers that reduce friction and stretch compared to a standard chain. This provides more accurate timing and increased durability under higher loads. |
| High Performance / Racing | Edelbrock, Melling Select Performance, Cloyes (Billet) | For serious performance or racing builds, a double roller timing set is the top choice. These are stronger, reduce friction even further, and often come with multi-keyway sprockets. These keyways allow a builder to advance or retard camshaft timing to fine-tune the engine's powerband. Brands like Edelbrock are well-regarded for their quality in performance applications. |
Known Issues & Recalls
There are no official recalls or Technical Service Bulletins (TSBs) from the NHTSA for the timing set on the 1967-1977 Oldsmobile Cutlass Supreme. The primary known issue is the failure of the original nylon-coated camshaft gear, which is a widely documented problem among owners and mechanics. Replacing the original set with any modern aftermarket steel set resolves this issue.
Frequently Asked Questions
Do I need a single or double roller chain?
For a stock or lightly modified street-driven Cutlass, a high-quality single roller or silent chain set is perfectly adequate and a huge upgrade over stock. A double roller chain is stronger and recommended for high-performance engines with aggressive camshafts, high-RPM use, or for anyone wanting maximum durability.
Should I replace the gears and chain together?
Yes, always. A worn chain will quickly wear out new gears, and worn gears will destroy a new chain. Timing components wear as a team. For this reason, they are sold as a complete set including the camshaft sprocket, crankshaft sprocket, and the timing chain.
What does a multi-keyway or adjustable sprocket do?
An adjustable sprocket, often found on performance sets, has multiple keyways on the crankshaft gear. This allows an engine builder to install the camshaft straight up (standard timing), or slightly advanced or retarded. Advancing or retarding cam timing shifts the engine's power band to a higher or lower RPM range. This is an advanced tuning feature not typically needed for a stock engine.
What is a "silent" timing chain?
A silent-type chain, often used in standard replacement kits, has a different link design than a roller chain. It's designed for quiet operation, similar to what manufacturers use from the factory. While a roller chain is technically stronger, a modern silent chain from a quality brand is very durable and more than sufficient for most applications.
Technical Specifications
Fits all 1967-1977 Oldsmobile V8 engines (330, 350, 400, 425, 455). Sets include a camshaft sprocket, a crankshaft sprocket, and a timing chain. Available in standard silent chain, single true roller, and double roller configurations. Performance sets may include multi-keyway sprockets for timing adjustments.
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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.