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Chevrolet big-block engine
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===Vortec 7400 (L21)=== The Vortec 7400 L21 was a [[Commercial vehicle|commercial]] version of the Chevrolet big-block engine used in the [[medium duty truck]] platform. Its design shared much with the L29 454, but with the addition of forged pistons and crankshaft, and [[Distributor|coil near plug ignition]]. It had slightly reduced power compared to the L29 454 and used a different [[Powertrain control module|PCM]]. The L21 was paired with the early 4-speed [[Allison Transmission|Allison]] [[automatic transmission]] or [[manual transmission]], depending on the application. L21 applications: * 1998β2001 [[Chevrolet Kodiak]]/[[GMC TopKick]]/[[Isuzu H-Series]] 4500 and 5500 * 1998β2001 P12 HD Motorhome Chassis. The Workhorse W-20 is a clone of the P12 Chassis.
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