Optispark Distributor Vacuum Harness – C4 Corvette (1992–1996)

Fits 1992–1996 Chevrolet Corvette with LT1 or LT4 engine. Replaces discontinued GM part number 12554393.

⚠️ Important: This harness is designed specifically for C4 Corvettes.
→ If you have a Camaro, Firebird, Impala SS, Fleetwood, Caprice, or Roadmaster, click here for the correct version.

Upgrade your worn or heat-damaged vacuum harness assembly with our high-quality replacement. The check valve and filter match the original micron rating and are constructed from Viton material for enhanced durability. Additionally, the check valve features an integral orifice to help prevent cap implosion.

Key Features:

• Optimized Vacuum Flow: Our harness assembly is designed with the correct vacuum orifice, ensuring optimal vacuum flow without risking distributor damage.
• High-Quality Construction: While not original equipment from the manufacturer, our harness is crafted to closely match original specifications and appearance. We use high-quality vacuum hoses and fittings for durability and reliable performance.

Please note: Minor variations may occur due to component availability.

Installation Tips:

Attaching the vacuum hose to the distributor cap can be challenging when the ambient temperature is below 85°F. To ease installation, we recommend using a non-silicone-based lubricant, such as WD-40 or CRC.