Choosing the Right Distributor for Your 1974-1979 Chevrolet Impala
A complete guide to upgrading or replacing the distributor in your classic Impala.
- For 1974 models, upgrading from the original points distributor to a new HEI unit is the most recommended and reliable option.
- Symptoms of a bad distributor include engine misfires, hard starting, rough idle, and stalling.
- Replacing a distributor requires using a timing light to set the engine timing correctly after installation.
- For stock engines, a quality replacement-style HEI from brands like WAI Global or Pertronix is sufficient; high-performance brands like MSD are for modified engines.
Is Your Impala's Distributor Failing?
A bad distributor can make your classic Impala run poorly or not at all. Because it controls spark timing, any problems will directly affect engine performance. Watch for these common signs of a failing distributor.
Key Symptoms of a Bad Distributor:
- Engine Misfires: The engine may jerk, stumble, or run rough, especially under acceleration. This happens when spark delivery is inconsistent.
- Difficulty Starting: A weak or incorrectly timed spark can make the engine crank for a long time before it starts, or prevent it from starting at all.
- Rough Idle: The engine may shake or sound uneven when the car is stopped.
- Poor Acceleration: If the distributor isn't advancing the timing correctly, the car may feel sluggish and lack power.
- Engine Stalling: The engine may suddenly shut off while driving or when coming to a stop.
The Most Important Choice: Points vs. HEI Upgrade
The 1974-1979 generation is split. 1974 models typically came with a points-style distributor, while 1975 and newer models came standard with the superior High Energy Ignition (HEI) system. This is the biggest factor in your buying decision.
- For 1974 Impala Owners: You can buy a direct replacement points-style distributor, but the most common and recommended path is to upgrade to an aftermarket HEI distributor. An HEI system provides a much hotter, more reliable spark, easier starts, and eliminates the need for regular points adjustments. Nearly all aftermarket distributors for this year are HEI upgrades.
- For 1975-1979 Impala Owners: Your car already has an HEI system. Your choice is between a standard replacement-style HEI distributor or a high-performance model for modified engines.
Choosing the Right Aftermarket Distributor Brand
Aftermarket distributors for your Impala fall into a few categories, from high-performance models to standard replacements. Your engine setup and budget will determine the best fit.
Performance & Racing Brands (MSD, FAST, Accel, Edelbrock)
These brands are for owners who want the absolute best performance, especially on modified engines with aftermarket cams, heads, or intakes. They offer superior spark energy, more stable timing at high RPM, and high-quality components.
- MSD: Often considered the top choice for performance ignition systems. MSD distributors offer excellent reliability and are built for high-RPM use. They are a popular, though more expensive, option.
- FAST (Fuel Air Spark Technology): Known for complete electronic fuel injection systems, their distributors are also high-quality and geared toward performance and racing.
- Accel & Edelbrock: Both are well-known performance brands that offer quality HEI distributors. They are a solid choice for street performance and mild engine builds.
OE-Style & Upgrade Brands (Pertronix, WAI Global)
These brands are perfect for daily drivers or restored vehicles. They offer reliability and modern technology without the high cost of racing parts.
- Pertronix: Famous for their points-to-electronic conversion kits, Pertronix also makes complete HEI distributors that are a fantastic, reliable upgrade for a stock or mildly modified engine.
- WAI Global: This brand manufactures 100% new distributors, not remanufactured ones. They are designed to meet or exceed original equipment specifications, making them a dependable, hassle-free choice for a standard replacement.
Budget & Remanufactured Brands (Cardone)
These brands focus on providing a low-cost alternative. Results can be mixed.
- Cardone: Cardone is the biggest name in remanufactured parts. They take original distributor cores and rebuild them. While this is a very budget-friendly option, quality can be inconsistent. Some users have great success, while others report early failures. It's a gamble, but can be a cost-effective solution if you get a good one.
Cost to Replace Your Impala's Distributor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Distributor | $111.58 - $776.20 |
| Shop Labor | $150 - $300 |
Costs are estimates and can vary by location and vehicle condition.
Frequently Asked Questions
Can I replace the distributor myself?
Yes, if you have some mechanical experience. The process involves removing the cap, marking the rotor and housing location, unbolting the old distributor, and installing the new one. The most critical and challenging step is setting the ignition timing correctly with a timing light after installation. If you are not comfortable with setting timing, it is best to have a professional do the job.
What is an HEI distributor and why is it an upgrade?
HEI stands for High Energy Ignition. It was GM's electronic ignition system that replaced the old points-and-condenser system in the mid-1970s. HEI provides a stronger spark, which improves starting, fuel economy, and performance. It is also more reliable and requires virtually no maintenance compared to points, which need to be adjusted or replaced regularly.
Do I need a high-performance distributor like an MSD?
For a stock or mostly stock engine, you do not need a high-end performance distributor. A quality OE-style HEI from a brand like Pertronix or WAI Global will be a significant improvement and work perfectly. High-performance distributors are designed for engines that operate at high RPMs or have significant modifications like aggressive camshafts or forced induction.
Are there any recalls for the 1974-1979 Impala distributor?
No. There are no active recalls or technical service bulletins (TSBs) from the NHTSA or General Motors for the distributor on the 1974-1979 Chevrolet Impala. Any issues you experience are due to the age and wear of the original components.
Technical Specifications
The primary specification is the ignition type. 1974 models may use a points-style distributor, while 1975-1979 models use a High Energy Ignition (HEI) distributor. Aftermarket HEI units are the most common replacement for all years in this range and feature a built-in coil on top of the cap.
We Have This Part in Stock
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.
- 🛍️ Shop This Part
- Is Your Impala's Distributor Failing?
- Key Symptoms of a Bad Distributor:
- The Most Important Choice: Points vs. HEI Upgrade
- Choosing the Right Aftermarket Distributor Brand
- Performance & Racing Brands (MSD, FAST, Accel, Edelbrock)
- OE-Style & Upgrade Brands (Pertronix, WAI Global)
- Budget & Remanufactured Brands (Cardone)
- Cost to Replace Your Impala's Distributor
- Frequently Asked Questions
- 🎟️ Get 5% Off