Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Core
Passage left in the cylinder block and head in the casting process. Cores are used as part of the cooling system. Also the inner portion of a tyre valve stem, consisting of a spring-loaded valve with a nylon head bearing on a seating to retain air inside the tyre. The valve is forced off its seating by incoming air under pressure to inflate the tyre and returns when the air-line is disconnected.
