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Standard Ignition DR-157 Distributor RotorOE Quality 60-Day Returns
Part #: DR-157

Standard Ignition DR-157 Distributor Rotor

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Fitment: Graham, Studebaker, GMC, Oldsmobile, Plymouth, Elcar, Graham-Paige, Auburn, and Erskine, Custom Model 107, Custom Model 108, Deluxe Model 107, Custom Special 96, Model 97, Special Model 96, Custom Model 97, Standard Model 96, Cavalier, Crusader, Series 116, Series 120, Cavalier Model 90, Crusader Model 80, Model 110, Dictator, T16L, Model 68, Model 74, F-35, Model 65, Deluxe PE Model, Standard PF Model, Standard PG Model, Dictator Special, Special, Standard, Dictator Model 62, Dictator Model 61, Model 75A, Model 612, Model 615, Commander, Model 75, Model 6-66, and Model 50
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Distributor Rotor for Reliable Ignition Output

Standard Ignition DR-157 is a distributor rotor built for consistent spark transfer and dependable ignition performance. It uses a high-dielectric alkyd body to help resist dirt buildup and reduce carbon tracking, supporting longer service life in the distributor assembly.

Compatible With Chevrolet and GMC applications that use this rotor style, including classic ignition service needs where stable voltage delivery matters. Part number DR-157 is also referenced by service numbers such as 4R1045 and 51-5554.

Key Features

  • Distributor rotor for ignition distributor service
  • Solid brass segments for improved conductivity
  • Helps deliver higher voltage spark to the plugs
  • High-grade dielectric alkyd resists dirt sticking
  • Designed to reduce carbon tracking over time
  • Shaft retention clips used where required for fit and performance

Product Details

This Standard Ignition distributor rotor is engineered for vehicles that rely on a conventional distributor ignition system. The brass contact design supports efficient current transfer from the distributor cap to the ignition leads, while the alkyd construction helps maintain electrical isolation inside the distributor. For Chevrolet and GMC ignition service, DR-157 provides a direct replacement option when the original rotor is worn, cracked, or showing signs of tracking. Part number DR-157 is commonly searched alongside DR909 and RR74 for the same application family.

What It Helps Fix

  • Misfires caused by worn rotor contacts
  • Weak spark transfer inside the distributor
  • Carbon tracking on the rotor surface
  • Rough idle from ignition breakdown
  • Hard starting related to distributor wear

Installation Notes and Tips

Inspect the distributor cap, rotor tip, and shaft condition before installation. Replace the rotor if the contact surface is burned, pitted, or cracked, and verify proper seating on the distributor shaft. For best results, clean the distributor interior before installing the new rotor and confirm the cap aligns correctly after service.

Quality Assurance

Standard Ignition draws on long-term ignition component development to produce distributor caps and rotors with consistent fit and electrical performance. DR-157 is built to support dependable service in distributor-equipped Chevrolet and GMC vehicles.

BrandStandard Ignition
Part NumberDR-157
ContentsDistributor Rotor

This part fits 0 vehicles. Search below:

YearMakeModelPositionNotes

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

12338686126931084534R104551-5554D8DR909RR74

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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