Help your classic GM's spark timing advance the way it was designed to with the Standard Ignition distributor vacuum advance, part number VC-262. This vacuum advance control is a direct-fit replacement for listed applications including the 1974 and 1977 Chevrolet El Camino, 1976-1977 Chevrolet Monza, 1977 and 1980 Chevrolet Camaro, 1979-1980 Cadillac DeVille and 1980 Pontiac Firebird. See the Buyer's Guide tab for the full list and engine details.
The unit mounts to the distributor and uses engine vacuum to advance ignition timing. Standard Ignition calibrates these units and tests them for leaks:
- Precision calibrated: set for correct ignition advance.
- Leak-tested: units are tested at 30HG maximum vacuum to check that they do not leak.
- Quality control: Standard is a global manufacturer of original equipment ignition products and controls quality throughout manufacturing, from componentry to the finished product.
- Ignition heritage: Standard has served the automotive aftermarket since 1919.
A vacuum advance may need replacing if the unit no longer holds vacuum, the engine hesitates or feels sluggish off idle, or fuel economy drops. Other ignition and vacuum faults can cause the same symptoms, so check the vacuum source and hose first. If a leaking or sticking vacuum advance is the cause, VC-262 replaces it.
Interchange: V399 · DV1843 · VC1843 · 1973508 · 1973631 · 1973693
This part cross-references / interchanges with the following part numbers:
V399, DV1843, VC1843, 1973508, 1973631, 1973693
