What is head?

head on view

Glossary “head on view” Definition:
Compares the test panel to the vehicle straight on , or perpendicular. Also refers to a reference point to determine front end alignment angles.

head gasket notch

Glossary “head gasket notch” Definition:
A series of one to four notches used to measure the thickness of a gasket to control the piston-to-head clearance on a diesel engine.


Glossary “head” Definition:
1). Part of an engine that covers the top of the cylinders and pistons and usually contains the combustion chambers and valve train. 2). That part of a compressor that covers the valve plates and separates the high side from the low side of an A/C system.