Help keep high-voltage spark reaching every cylinder in firing order with the Standard Ignition Distributor Rotor DR-309. It is a direct-fit replacement for the listed applications, including the 1954-1955 Oldsmobile 88 and Super 88, 1955-1956 Chevrolet Bel Air, 1955-1957 and 1960 Chevrolet Corvette, 1955 GMC Truck, and 1955-1956 Pontiac Star Chief.
The rotor turns with the distributor shaft and carries the coil's high voltage to each distributor cap terminal in turn, which then feeds the spark plug wires. Standard is a global manufacturer of original equipment ignition products and controls quality at every stage of production, from the components to the finished rotor.
- High-grade dielectric alkyd: Dielectric strength alkyd resists dirt sticking to the rotor, which helps reduce carbon tracking for extended service life.
- Solid brass segments: Specified for better conductivity and higher-voltage spark to the plugs.
- Shaft retention clips where required: Where an application calls for one, Standard's rotors use a shaft retention clip for a proper fit on the shaft.
- Decades of development: Standard's distributor caps and rotors build on decades of research and development.
Signs a distributor rotor may need replacing include misfires, hard starting or a no-start, and rough running. An inspection may also show a burned or pitted rotor tip or visible carbon tracking on the rotor. If a worn rotor is the cause, this part replaces it; it is good practice to inspect the distributor cap at the same time. Fitment also covers additional Chevrolet, GMC, Oldsmobile, and Pontiac cars and trucks. See the "Vehicles it fits" section for the full list and engine details.
Interchange: 9001741 · D134 · 87784 · DR949 · RR157 · 12338682 · 19106980 · 1927393
This part cross-references / interchanges with the following part numbers:
9001741, D134, 87784, DR949, RR157, 12338682, 19106980, 1927393
Frequently Asked Questions
What does a distributor rotor do?
It spins with the distributor shaft and transfers high voltage from the coil to each distributor cap terminal in firing order. From there, the spark travels through the plug wires to the spark plugs.
Which vehicles does the Standard DR-309 fit?
It fits the listed applications, including the 1954-1955 Oldsmobile 88, 1955-1956 Chevrolet Bel Air, 1955-1957 and 1960 Chevrolet Corvette, and 1955-1956 Pontiac Catalina. See the "Vehicles it fits" section for the full list.
What are the DR-309 rotor segments made of?
The DR-309 uses solid brass segments. Standard specifies them for better conductivity and higher-voltage spark to the plugs.
What is carbon tracking, and how does this rotor address it?
Carbon tracking is a conductive path that can form on the rotor surface and let spark leak away. Standard's high-grade dielectric strength alkyd resists dirt sticking, which helps reduce carbon tracking.
What signs suggest my rotor may need replacing?
Misfires, hard starting, rough running, or a burned or pitted rotor tip may indicate a worn rotor. Diagnose the ignition system first. If the rotor is the cause, the DR-309 replaces it.
