General
Motors is adding in-line four- and five-cylinder versions to its Vortec lineup
to power future North American market truck and SUV models.

The new engines are derived from the six-cylinder Vortec 4200 recently introduced
with the 2002 GMC Envoy, Chevy TrailBlazer and Oldsmobile Bravada.

The engines will be manufactured at GM Powertrain’s new plants in Tonawanda,
New York and Flint, Michigan.

Flint Engine South, which began production of the 4200 six in January 2001,
will initially produce the five-cylinder engine.

Flexible manufacturing technology allows the plant to machine and assemble
both engines on the same lines. A similar system at Tonawanda will accommodate
the four- and five-cylinder versions.

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GM has allocated almost $1 billion for the new engine plants.

The Vortec engine family has approximately 75 percent of it parts in common
and the four- and five-cylinder engines feature the same dual overhead camshaft,
four-valves-per-cylinder layout as the six.

A 10:1 compression ratio, electronic throttle control, variable valve timing,
coil-on-plug ignition and direct-mount accessories are also common to all three
versions.

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