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by Matt Brogan

GM has indefinitely delayed the release of one of the most advanced engines it has ever designed amid the current financial woes it is suffering.

The 4.5-litre Duramax diesel engine, which was intended for use in light-duty trucks such as the Chevrolet Silverado and GMC Sierra, featured unique cylinder heads that eliminate the intake and exhaust manifolds. It also had a lightweight block with advanced castings for the crankshaft-bearing journals and oil-circulation system.

“We have to make tough decisions right now,” said GM Powertrain spokeswoman Susan Garavaglia.

The eagerly awaited engine was due to have began production this time next year.




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