GM GENUINE PARTS Distributor Cap D328A (10452458) OEM-fit replacement, anti-arc, durable polymer

The GM Genuine Parts D328A (10452458) distributor cap is an OEM-quality replacement cap that restores proper ignition routing and electrical insulation for compatible GM vehicles.

The D328A distributor cap from GM Genuine Parts is built to match factory specifications for fit, electrical conductivity, and durability. Designed as a GM-recommended replacement for the original component, this cap covers the distributor assembly and forms the upper portion of the rotary switch that distributes high-voltage current from the ignition coil to spark plug wires. It’s engineered to deliver consistent contact, resist arcing, and simplify installation so the ignition system can operate as intended.

How does this distributor cap improve ignition consistency?

The D328A restores the intended electrical pathways between the ignition coil and each spark plug wire, reducing misfires that can occur from worn or degraded caps. It uses metal inserts and precise tower alignment to maintain reliable conductivity under normal engine conditions.

• Factory-matched metal inserts for steady electrical contact
• Full anti-arc barrier reduces secondary arcing and misfires
• Exact tower spacing to match original rotor and wire routing

Will this part be easy to install on my GM vehicle?

Yes — the D328A is manufactured to GM OE dimensions to make replacement straightforward and fast. Locator keys and clear alignment features help ensure the cap seats correctly on the distributor housing, preventing improper installation that could affect timing or contact pressure.

• Easy-to-read locator keys for correct positioning
• OE-fit mounting points align with factory hardware
• Compatible with original rotor and wire harness layouts

What durability features help this cap last like the original?

GM Genuine Parts constructs the cap from materials selected to withstand heat, vibration, and electrical stress typical of engine compartments. The result is a service life and reliability comparable to the original factory component, maintaining stable performance over time.

• Durable polymer housing resists heat and engine vibration
• Corrosion-resistant metal inserts maintain conductivity
• Engineered anti-arc barrier limits internal electrical breakdown

How do I know this is the right replacement for my vehicle?

The D328A (10452458) is a GM-recommended replacement part specified to match the original distributor cap for certain GM models. Confirm fitment by cross-referencing the part number with your vehicle’s year, make, model, and engine option or consult a dealer parts lookup.

• Part number: D328A (10452458) for direct OE-replacement compatibility
• Recommended by GM as an equivalent to the factory-installed cap
• Check vehicle fitment using VIN or dealer parts lookup

Who is this for: The GM Genuine Parts D328A distributor cap is intended for technicians, DIY mechanics, and vehicle owners who need a direct-fit, factory-grade replacement for a worn or failing distributor cap on compatible GM vehicles. Choose this cap if you want an OE-matching component that simplifies installation, maintains correct ignition routing, and reduces the chance of secondary arcing without modifying the original ignition system.