Where are most of the NASCAR engines built?

Answer 1

Despite the fact that the SC in "NASCAR" officially stood for "stock car", there's absolutely nothing "stock" about the engines used. They have to be iron-block V8s with a carburetor. Beyond that ... there are rules, but about half the work of a racing team is figuring out some way to tweak the current rules to gain an edge, and the engines are all very heavily modified to the point that whatever the "base" engine was most likely doesn't have all that much in common with what's actually sitting under the hood.

Answer 2

In the teams shop! Dale Jr. has a shop in Mooresville, NC aka JR Motorsports.