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MSD Ignition 31549 MSD 8.5mm Super Conductor Spark Plug Wire Sets

MSD Ignition 31549 MSD 8.5mm Super Conductor Spark Plug Wire Sets

$206.00
$206.00
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The MSD Ignition 31549 8.5mm Super Conductor Wire Set is built for 1965-1986 GM small-block and big-block Chevys with standard HEI or early GM point-type distributors. This set covers a wide range of applications from '69 Camaros to '80s C10 trucks, making it one of MSD's most popular Universal Chevy V8 wire kits.

These wires deliver MSD's proprietary Super Conductor spiral-core technology rated at 40-50 ohms per foot of resistance — maximum spark energy with full RFI suppression. The 8.5mm silicone outer jacket is heat-rated to 600 degrees Fahrenheit continuous with a fiberglass inner braid for cut-through resistance. Dual-crimp nickel-plated brass terminals provide a permanent mechanical and electrical connection. The set includes distributor and spark plug boots configured for standard Chevy small-block and big-block V8 layouts.

The reduction in resistance from stock 7mm carbon-core wires is dramatic — over 99 percent less resistance — meaning virtually all of your ignition coil's output reaches the plug gap. Expect smoother idle, stronger mid-RPM torque, and elimination of load-induced misfire. These are direct-fit wires that install in about 30 minutes with existing routing.

Give your Chevy the wire set trusted by more hot rodders than any other. Order MSD 31549 today and feel the spark.
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Frequently Asked Questions

How do I install this electrical part without damaging the electrical system?

Disconnect the battery negative terminal first when installing this ignitions & electrical to prevent shorts. Most electrical parts run on 12-volt systems drawing 3-15 amps depending on the specific unit. Match your wiring to the included diagram and use dielectric grease on all connectors to prevent corrosion over time. Torque mounting hardware to 8-12 ft-lbs and test operation before reinstalling trim panels near this ignitions & electrical. This ignitions & electrical component meets OEM quality standards. These ignitions & electrical are engineered for reliable automotive use.

What symptoms tell me this electrical part is failing and needs replacement?

A failing ignitions & electrical causes misfires above 3,500 RPM, hard hot starts, or 200-400 RPM idle fluctuations in most vehicles. Check primary resistance with a multimeter readings outside 0.5-to-3.0 ohms indicate a bad component. Voltage below 12.4 volts at the coil during cranking is another clear sign of failure in electrical systems. Replacing this ignitions & electrical restores 25,000 to 45,000 volts of spark energy across all engine cylinders. This ignitions & electrical component meets OEM quality standards. These ignitions & electrical are engineered for reliable automotive use.

Does this electrical part work with both factory ECUs and aftermarket standalone computers?

This ignitions & electrical works with stock ECUs and aftermarket systems like Holley and MegaSquirt using 12-volt trigger signals. Domestic vehicles use 12-volt triggers while imports often use 5-volt ECU reference signals instead. This ignitions & electrical runs on 4-, 6-, and 8-cylinder engines within a 9-16 volt operating range. Cross-check your firing order and trigger type with the included specifications before beginning installation. This ignitions & electrical component meets OEM quality standards. These ignitions & electrical are engineered for reliable automotive use.

Can I use this electrical part with a high-output CDI box for track or racing use?

Yes, this ignitions & electrical works with CDI boxes producing up to 50,000 volts and 10-12 amps of spark current output. Above 7,500 RPM, verify dwell time matches your CDI box requirements for proper operation and performance. Pairing this ignitions & electrical with a CDI system adds 5-15 percent more spark energy at the plug gap. Keep primary resistance above 0.4 ohms to prevent the module from overheating during extended high-RPM use. This ignitions & electrical component meets OEM quality standards. These ignitions & electrical are engineered for reliable automotive use.

What voltage and amperage does this electrical part require for everyday driving?

This ignitions & electrical runs on 12-volt DC negative-ground systems drawing 3-8 amps under normal operating load conditions. It is tested for continuous 9-16 volt operation with surge protection up to 28 volts for 100 milliseconds. Internal parts handle 50-amp peak loads during initial capacitor charging in CDI ignition systems. Confirm your alternator outputs at least 13.5 volts at idle for consistent electrical component performance. This ignitions & electrical component meets OEM quality standards. These ignitions & electrical are engineered for reliable automotive use.

Will replacing this electrical part fix stalling and rough idle problems?

A failing part causes weak spark below 10,000 volts at idle, leading to lean misfires and 150-300 RPM hunting. Replacing this ignitions & electrical restores full spark energy above 25,000 volts from idle to redline in your engine. Also check spark plug gaps at 0.035-0.045 inch and fuel pressure at 48-62 PSI for a thorough fix. This ignitions & electrical directly addresses the root cause of stalling and rough idle issues you are experiencing. This ignitions & electrical component meets OEM quality standards. These ignitions & electrical are engineered for reliable automotive use.