Standard Ignition DR-306 Distributor Rotor

Distributor Rotor for Classic GM Ignition Systems

Standard Ignition DR-306 is a distributor rotor for select 1951-1956 Buick, Cadillac, and Oldsmobile applications. It is built for classic ignition service where stable conductivity, clean spark transfer, and proper distributor fit are important.

• High-grade alkyd body resists dirt buildup to help reduce carbon tracking
• Solid brass segments support better conductivity and stronger voltage transfer to the plugs
• Shaft retention clips are used where required for fit and performance
• Contents: distributor rotor
• Fits select Buick Century, Buick Roadmaster, Cadillac Commercial Chassis, Cadillac DeVille, Cadillac Eldorado, Buick Skylark, and Oldsmobile 88/98/Starfire applications

Fitment Details

• Fits 1954-1956 Buick Century, N/A
• Fits 1953-1956 Buick Roadmaster, N/A
• Fits 1951-1955 Cadillac Commercial Chassis, N/A
• Fits 1953-1955 Cadillac DeVille, N/A
• Fits 1953-1955 Cadillac Eldorado, N/A
• Fits 1954 Buick Skylark, N/A
• Fits 1954 Oldsmobile 88, N/A, Dist. No. 1110843
• Fits 1954 Oldsmobile 98, N/A, Dist. No. 1110843
• Fits 1954 Oldsmobile Starfire, N/A, Dist. No. 1110843
• Fits 1951-1953 Oldsmobile 98, N/A

How It Works

DR-306 routes ignition voltage from the distributor cap to the correct terminal as the distributor turns. The brass contact design and dielectric-resistant rotor material help maintain consistent spark delivery in vintage Buick, Cadillac, and Oldsmobile ignition systems. This part cross-references 3-403 and DR943 for the same application.

Common Repair Symptoms

• Engine misfire caused by worn rotor contacts
• Hard starting from weak or inconsistent spark transfer
• Carbon tracking inside the distributor
• Rough idle or intermittent ignition performance
• Distributor service on classic GM vehicles with the listed applications

Installation Notes

Verify distributor number and rotor indexing before installation, especially on 1954 Oldsmobile 88, 98, and Starfire models with Dist. No. 1110843. Inspect the distributor cap, terminals, and shaft condition at the same time to avoid repeat ignition faults. Confirm the rotor seats correctly on the distributor shaft and turns without interference.

Quality Assurance

Standard Ignition uses materials selected for electrical strength and service durability in ignition components. DR-306 is engineered with brass segments and a rotor body that helps resist dirt adhesion, supporting reliable operation in classic distributor systems.