Subject: Ignition Timing
Model and Year: 1955 6 & V-8 Engines
Source: Chevrolet Technical Service Bulletin
Bulletin No: DR - 190
Section: VI
Date: December 13, 1954
TO: ALL CHEVROLET DEALERS
An alternate method of setting ignition timing on 1955 6 and V-8 Engines may be used in the Field to obtain more consistent results at idle.
6-ENGINE
Disconnect the Vacuum Spark Advance Unit and set spark of #1 cylinder at 5° BUDC at 1000 RPM.
V-8 ENGINE
Disconnect the Vacuum Spark Advance Unit and set spark #1 cylinder at 8° BUDC at 1000 RPM.
The present Shop Manual method of setting at idle may be used even though the 1000 RPM method is preferred. In either case, ignition timing may be advanced or retarded to obtain acceptable detonation and performance.
Article ID: 1151
Created: January 30, 2015
Last Updated: January 30, 2015
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1955-corvette-service-bulletin-ignition-timing-1151.html