There are several factors that contribute to this stretching, some of which are serious problems that can be addressed through upgrades of their own. The best way to prevent head gasket failure on the 6 L is to install ARP Head Studs preventively.
A linguist is someone who studies language. Linguists study every aspect of language, including vocabulary, grammar, the sound of language, and how words evolve over time. The study of language is called linguistics, and people who study linguistics are linguists. Being a linguist isn't easy; you usually have to go to graduate school and conduct research about a specific aspect of language. There are computational linguists, forensic linguists, comparative linguists, and many other specialties.
It overlaps each of the human sciences including psychology, neurology, anthropology, and sociology. Linguists conduct formal studies of sound structure, grammar and meaning, but they also investigate the history of language families, and research language acquisition. And as other scientists, they formulate hypotheses, catalog observations, and work to support explanatory theories.