Glossary “twin torsion bar” Definition:
A suspension system having two torsion bars, one placed above the other.

Glossary “Twin Grip” Definition:
Limited-slip differential by AMC.

Glossary “twin plug head” Definition:
Cylinder head having provisions for two spark plugs per cylinder.

Glossary “twin plug ignition system” Definition:
Ignition system having two distributors, two coils, and two plugs per cylinder.

Glossary “twin I-beam” Definition:
Front suspension using two I-beams, each attached to the chassis at the end opposite the wheel, and coil spring at the wheel end.

Glossary “twin cam” Definition:
Dual overhead camshafts.