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Gullwing Box

A crossover tool box for a pickup truck's bed that has two lids, one on the driver's side and one on the passenger side. These lids are hinged in the center of the box, so they swing open from either side of the truck. Also see truck box.

Gulp Valve

A valve that opens in an air-injection system to admit extra air into the intake manifold upon deceleration, thus "leaning out" the mixture to prevent backfiring.

Gum

Residue that remains when gasoline is allowed to sit for a period of time.

Gumballs

1. Drag racing tires made of especially soft, sticky compound. 2. The rotating light in a hemispherical housing on top of a police car or emergency vehicle.

Gun It

To rev up an engine suddenly.

Gun-drilled Oil Holes

Holes that are drilled to allow oil to be fed to the piston pin.

Gurgle Method

A method of adding refrigerant from small cans to a system without running the engine.

Gusset

A triangular piece of metal used to add strength to a corner.

Gut

To remove non-functional parts of a vehicle in order to reduce its weight.

Guts

1. The internal structure of a vehicle. 2. The essential working parts of a device.

GVW

Gross vehicle weight.

GVWR

An acronym for gross vehicle-weight rating. Total weight of a vehicle plus its maximum rated payload.

Gymkhana

An individually clocked maneuverability contest for sports cars over an extremely tight course.