A helical design produces an even, constant tooth loading in a gearset, thereby reducing noise. Hemi A term used to describe any engine that has hemispherical combustion chambers in its cylinder head . Although a four-valve design is more efficient, a hemi head provides room for a pair of large valves and offers good breathing characteristics. Horsepower The common unit of measurement of an engine's power. Hotchkiss Suspension A live-axle rear suspension in which leaf springs handle both the axle's springing and its location.
Hydraulic lifters reduce valvetrain noise and are maintenance-free.
Any suspension in which the camber of a wheel is not directly affected by the vertical motion of the opposite wheel. The mixture of fuel and air that flows into the engine. The network of passages that direct air or air-fuel mixture from the throttle body to the intake ports in the cylinder head . The flow typically proceeds from the throttle body into a chamber called the plenum , which in turn feeds individual tubes, called runners, leading to each intake port. Engine breathing is enhanced if the intake manifold is configured to optimize the pressure pulses in the intake system.