1941-1947 GMC CCX250 Ignition Contact Set and Points Guide
Keep your classic GMC's engine running smoothly with the right set of ignition points.
- The Ignition Contact Set, or points, is a regular maintenance item on your 1941-1947 GMC CCX250 and should be replaced periodically, not just when it fails.
- Always replace the condenser at the same time as the points to ensure longevity and proper function.
- Correctly setting the point gap with a feeler gauge is the most critical part of the installation for proper engine timing and performance.
- Standard Ignition is a reputable aftermarket brand for vintage ignition components.
Symptoms of Failing Ignition Points
On a vintage truck like the GMC CCX250, the ignition points are a wear item that requires regular service. When they start to fail, you'll notice clear signs. The contact surfaces can become pitted or burned, or the rubbing block that rides on the distributor cam can wear down. This leads to poor engine performance. Common symptoms include difficulty starting, a rough idle, engine misfiring or stumbling during acceleration, and even stalling at low speeds. You might also experience engine backfiring. These issues occur because worn points can't deliver a consistent, well-timed spark to the engine.
Choosing the Right Aftermarket Ignition Set
For a 1941-1947 vehicle, new original equipment (OEM) parts are no longer manufactured. The market consists of New Old Stock (NOS) parts, which are original but can be very expensive and hard to find, and aftermarket parts. For a regular maintenance part like an ignition contact set, a quality aftermarket brand is the most practical and reliable choice. Standard Ignition (a brand of Standard Motor Products) is a long-established company known for producing dependable ignition components for American vehicles of this era. Their "Blue Streak" line, in particular, has a reputation for quality among classic car owners. When replacing points, it is always recommended to also replace the condenser.
Cost Comparison: Ignition Contact Set
| Part Type | Price Range |
|---|---|
| New OEM | N/A (NOS parts vary widely) |
| New Aftermarket | $21.44 |
| Used OEM | Not Recommended |
| Shop Labor | $100 - $200 |
Pro Tip: Many owners of classic trucks choose to upgrade from mechanical points to a solid-state electronic ignition conversion kit. These kits, like those from PerTronix, eliminate the need for points and condensers altogether, offering improved reliability and reduced maintenance. However, they are significantly more expensive than a standard set of points.
Frequently Asked Questions (FAQ)
How often should I replace the ignition points on my CCX250?
Ignition points are a regular maintenance item. Unlike parts on modern cars that are replaced only when they fail, points should be inspected and replaced periodically. A typical service interval for points in a classic vehicle is between 5,000 and 15,000 miles, or annually if you drive infrequently.
Do I need to replace the condenser at the same time?
Yes, it is highly recommended to replace the condenser whenever you replace the points. The condenser absorbs excess voltage to prevent the points from arcing and burning out prematurely. A faulty condenser can cause new points to fail very quickly.
What does "setting the gap" mean?
Setting the gap is the most critical step of the installation. It refers to adjusting the small space between the point contacts when they are fully open. This is done using a feeler gauge. The correct gap is essential for proper ignition timing and dwell angle, which determines how long the coil has to build a charge. An incorrect gap will lead to poor engine performance.
Is replacing ignition points a DIY job?
Yes, for someone with basic mechanical skills and the right tools (screwdriver, feeler gauge), this is a very feasible DIY job. It was a common task for vehicle owners in the 1940s and 50s. The key is to be careful not to drop the small screws into the distributor and to set the point gap correctly.
Technical Specifications
Mechanical ignition contact set for 6-cylinder Delco distributors. Includes points and may be paired with a condenser.
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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.