That may be true for a car since in most cases by the time the head wears out on a car the body is shot too and few want to go through the trouble of totally rebuilding one of todays disposable cars. Now where a Triumph in concerned most people I know would rebuild and rebuild and rebuild not dispose of like a Jap bike or car. The lack of bearings makes that much more expensive to do. I don't even remember how many times I rebuilt my 66 TR6C anymore.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!