Ignition Contact Set Guide for the 1942-1947 GMC CC260
Keep your classic GMC's ignition system reliable with the right set of points.
- Failing ignition points cause no-start, rough running, and stalling.
- Always replace the condenser along with the ignition points for best results.
- Standard Motor Products (Standard Ignition) is a trusted aftermarket brand for this part.
- Properly setting the point gap with a feeler gauge or dwell meter is critical for engine performance.
Signs of a Failing Ignition Contact Set
Ignition points are a wear item and require periodic replacement. As they wear out, the contacts can become pitted, burned, or misaligned, leading to a range of engine performance problems. If you notice any of the following symptoms, it may be time to inspect and replace your ignition points.
- Difficulty Starting or No-Start: This is one of the most common signs of bad points. Worn contacts can't create the proper electrical signal, resulting in a weak or non-existent spark. The engine may turn over but fail to fire up.
- Engine Misfires and Rough Running: Inconsistent spark from failing points can cause a cylinder to misfire. This leads to a rough idle, engine hesitation, and a general lack of smoothness while driving.
- Stalling: Your truck may stall, especially at idle or when coming to a stop. This happens when the points are too worn or dirty to maintain a consistent connection.
- Backfiring: If the condenser, which works with the points, is failing, it can cause the current to arc across the points incorrectly. This leads to erratic ignition firing and potential backfiring.
Choosing the Right Aftermarket Ignition Points
For a vintage truck like the 1942-1947 GMC CC260, finding original OEM parts is nearly impossible. The market relies on aftermarket manufacturers to keep these vehicles on the road. Fortunately, reputable brands still produce quality ignition components.
Aftermarket Brand Assessment
| Brand Tier | Brand(s) | Quality & Performance Notes |
|---|---|---|
| Standard Aftermarket | Standard Motor Products (Standard Ignition) | Standard Motor Products, particularly their 'Blue Streak' line, is a well-regarded choice for vintage ignition components. They are known for using quality materials, such as high-conductivity contacts and durable breaker arms, designed to meet or exceed original specifications. For a vehicle like the CC260, a Standard Ignition contact set is a reliable and readily available option. |
A Note on Quality
While modern manufacturing can produce parts with better durability than some originals, the quality of ignition points can vary. Stick with known brands like Standard Ignition to ensure proper fit and reliable performance. Always inspect new points before installation for any visible defects.
Frequently Asked Questions (FAQ)
What else should I replace with my ignition points?
It is standard practice to replace the ignition condenser at the same time as the points. The condenser helps prevent the points from arcing and burning out prematurely. It's also a good time to inspect the distributor cap and rotor for cracks, carbon tracking, or corrosion and replace them if necessary.
What tools are needed to replace ignition points?
You will need basic hand tools like a screwdriver and wrenches to access the distributor. The most important special tool is a feeler gauge to set the point gap correctly. For a more precise adjustment, a dwell meter is recommended.
What is the difference between setting the 'gap' and 'dwell'?
The 'gap' is the physical distance between the contacts when the points are fully open, measured with a feeler gauge. 'Dwell' is the amount of time (measured in degrees of distributor rotation) that the points remain closed. Adjusting the gap directly changes the dwell angle; a smaller gap increases dwell, and a larger gap decreases it. Using a dwell meter is a more accurate way to set the points, as it compensates for any wear on the distributor cam lobes.
Can I convert to an electronic ignition?
Yes, many owners of classic vehicles choose to replace their points and condenser system with an aftermarket electronic ignition conversion kit. These kits eliminate the need for periodic point adjustments and can provide a more consistent spark. However, for those wanting to maintain originality, a properly maintained points system is very reliable.
Technical Specifications
This is a mechanical contact set located inside the distributor. It functions as a switch triggered by the distributor cam lobes. For the 6-cylinder engine in the CC260, a precise gap and dwell angle setting is required for proper operation.
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.