Bulletin Number: DR #577
Date: February 27, 1963
Section: VIy
Subject: Distributor Breaker Point Burning
Models: 1963 Corvette and 409" Engines
To eliminate distributor point burning during cold-weather operation, a new higher value ignition primary resistor entered production on February 4, 1963, for all 250 H.P. or 300 H.P. Corvettes and 340 H.P. 409" Passenger Cars.
If premature cold-weather point burning is encountered on the above models, built prior to the production change, install resistor No. 1957154 (1.8 ohms) in place of variable resistor No. 1931385 (approx. 0.3 ohms resistance when cold).
Resistor No. 1957154 may also be used on 340 H.P. or 360 H.P. Corvettes, 400 H.P. or 425 H.P. 409’s, and the Corvair Spyder for temporary winter operation; however, it should be pointed out to the owner that resistor No. 1931385 will provide the best possible high-speed ignition performance.
PARTS DATA
PART NO.
1957154: Ignition Primary Resistor - 1.8 ohms (Service part identified by blue stripe)
1931385: Ignition Primary Resistor - 0.3 ohms (Service part identified by black dot)
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
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Article ID: 54
Created: July 2, 2014
Last Updated: July 2, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1963-corvette-service-bulletin-distributor-breaker-point-burning-54.html