Optispark Distributor Vacuum Harness – LT1/LT4 (1994–1997 B/D/F-Body)
Vacuum harness for LT1 and LT4 engines equipped with a ventilated Optispark distributor, found in B-, D-, and F-body vehicles including the Camaro, Firebird, Impala SS, Fleetwood, Caprice, and Roadmaster. Replaces discontinued GM part number 12555323.
⚠️ Important: This harness is not compatible with Corvettes as the Corvette version is shorter.
→ Click here for the Corvette-specific harness.
Upgrade your worn or heat-damaged vacuum harness assembly with our high-quality replacement. Our assembly includes the correct micron filter, check valve, fitting, and hose to suit GM ventilated Optispark distributors.
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, fittings, and valves 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.
