 In 1963, Pontiac replaced the 215 with a "new" 326, which was really a 336 with a bore of 3.78 and stroke of 3.75 (same stroke as the 389), an iron-block mill that had the same external dimensions and shared parts with the 389, but an altered, reduced bore.The car's body and suspension were also changed to be lower, longer, and wider.The response was that more than half of the 1963 Tempests and LeMans (separate lines for that one year only) were ordered with the V8, a trend that did not go unnoticed by management.