The Hendrick Motorsports cars had major engine problems during practice for the Daytona 500. The two-time defending Nascar champion and Daytona pole-sitter Jimmie Johnson, the four-time series champ Jeff Gordon, Dale Earnhardt Jr. and Casey Mears were forced to change engines because of a lifter problem probably caused by a bad batch of coating.In all, five of the nine Hendrick-powered cars had problems. The engine swaps will send those five Chevrolets to the back of the field in their 150-mile...