During yesterday’s media event that revealed the 2014 Chevrolet Silverado and GMC Sierra pickup trucks also came the announcement of a new engine family: the EcoTec3 line. And while the aluminum-based engines share next to nothing in common with the outgoing Vortec line, the displacements remain the same. As such, a 4.3L OHV V6 remains in the lineup as the base work-truck engine, but not as you’ve known it before.
This big V6 shares a lot of fuel-saving features with the larger V8 engines, including direct injection, variable valve timing, and yes, even cylinder deactivation. One might think that if the 5.3L and 6.2L engines shut off half their cylinders to reduce fuel, the 4.3L EcoTec3 would do the same. No. Instead, the V6 engine will also replicate its big brothers by switching to a four cylinder engine in certain driving conditions, deactivating two of its cylinders.
We still await the official output and fuel economy ratings at this point. So we’ll leave it up to you to speculate.