In addition to notifying NHTSA (or Transport Canada) in a situation like this, please notify General Motors.
Call 1-800-222-1020, or write:
Chevrolet Motor Division
Chevrolet Customer Assistance Center
P.O. Box 33170
Detroit, MI 48232-5170
In Canada, call 1-800-263-3777 (English) or
1-800-263-7854 (French), or write:
General Motors of Canada Limited
Customer Communication Centre, CA1-163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Reporting Safety Defects to the Canadian Government
Service Publications Ordering InformationChevrolet Cobalt Service & Repair Manual. Engine Rebuild Specifications
Cylinder Head, Valve Guide, & Valve Seat
All Measurements Given In Inches
Unless Otherwise Specified
Engine (VIN) 1
Year
Cylinder Head Warpage Limit
Cylinder Head Height/Thickness
Valve Guides
V ...