Keep the spark going to the right cylinder with the ThunderSpark Distributor Cap 925-1005 (also written 9251005), an OE-replacement cap for conventional distributor-based ignition systems. It's a direct-fit replacement across a huge range of classic and late-model GM applications, including the 1974-1987 Chevrolet Camaro, 1974-1990 Chevrolet Caprice, 1975-1986 Chevrolet C10, 1974-1989 Buick LeSabre, 1975-1980 Cadillac DeVille, 1974-1986 Pontiac Firebird, and 1985-1988 GMC B6000 — see the Buyer's Guide tab for the full 199-vehicle list and the engine that applies to yours.
The distributor cap directs high-voltage current from the ignition coil to the correct spark plug by way of the rotor and internal terminals. Over time, caps can develop carbon tracking, cracking, or corrosion, which may show up as misfires, hard starting, and drivability issues.
- Heat-Resistant Materials: constructed with high-dielectric compounds to withstand high voltage, thermal cycling, and engine vibration.
- Directs High-Voltage Spark: routes ignition-coil output to the correct cylinder to support the proper firing order.
- Exact OE Fit: designed to fit the original distributor housing and maintain secure contact with the rotor and ignition wires.
- OE Replacement Quality: built to meet OE specs for terminal alignment, dielectric strength, and conductive-path precision.
If a cracked or worn cap is the cause of your misfire or hard start, this replaces it as part of a tune-up or ignition repair.
