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GM applies for LT5, LTX trademarks... are new small block variants coming?

Recently discovered General Motors trademark applications for LT4, LT5, LT88 and LTX have observers wondering what kind of high-performance offerings could be on their way. A new LT4 would mark a return of the engine designation first used on the Corvette Grand Sport, SLP Pontiac Firehawk and SLP Chevrolet Camaro SS from 1996 and 1997. Supposition at Corvette Forum - which provided advance intel on the C7 like these leaked images - believes a new LT4 could go into the high-performance trim of the next-gen, 2015 Camaro that would be more powerful than the 580-horsepower Camaro ZL1.
Seeing an LT5 again would also be déjà vu - in its former life it was a 5.7-liter V8 for the C4 Corvette ZR-1 from 1990-1994 designed by Lotus, producing from 370 hp to 405 hp. A mix of rumor and hope is that the new LT5 will be a supercharged evolution of the 6.2-liter LT1 (pictured) placed in the new C7 Corvette, and that it will go into the C7 version of the ZR1 pumping out something like 700 hp.
The LTX trademark is, as with that last letter, a complete mystery. If the "X" isn't a generic way to denote the whole LT family, it's wondered if it LTX could refer to a crate motor offering like the LSX.

GM pauses 3.0-liter turbodiesel production due to a supplier shortage

General Motors confirmed it has temporarily stopped taking orders for trucks and SUVs equipped with the 3.0-liter Duramax turbodiesel six-cylinder engine. It blamed the last-minute pause on a supplier-related shortage. Website TFL Truck first reported the news, and a representative from General Motors quickly confirmed it. The spokesperson explained the issue is due to a "temporary part shortage" and added that production will resume "as soon as possible," meaning the Duramax engine (which is called LM2 internally) is not going away permanently. Additional details are not available, so we don't know if the issue is related to the ongoing chip shortage. Rather than delay deliveries and create a backlog, General Motors is reportedly asking its dealers to encourage buyers who want a turbodiesel engine to instead select either the 5.3-liter V8 or the 6.2-liter V8, depending on the model selected. Both are gasoline-powered units. There's no word yet on when Duramax production will resume. The shortage affects several models, including Chevrolet's Tahoe, Suburban, and Silverado 1500 and GMC's variants of these trucks. Cadillac's Escalade is temporarily diesel-less as well. Heavy Duty variants of the Silverado and the Sierra are not affected because they're powered by a different Duramax engine with eight cylinders. Motorists seeking a full-size SUV powered by an efficient turbodiesel engine are temporarily out of options because the Tahoe/Yukon and the Suburban/Yukon XL had the segment to themselves. The Duramax was surprisingly popular, too: in May 2021, GM Authority reported that the turbodiesel straight-six represented 8% of Suburban sales and 6% of Tahoe sales. Installed in a rear-wheel-drive Tahoe, the engine returns 21 mpg in the city, 28 mpg on the highway, and 24 mpg in a combined cycle, figures that make the body-on-frame behemoth more efficient than the unibody, front-wheel-drive Chevrolet Blazer that's 20 inches shorter and approximately 1,700 pounds lighter. Related video: 2021 Chevrolet Tahoe 3.0L Duramax engine

Nissan Leaf sales drop, new Chevy Volt climbs in November

This is probably just how things are going to be from now on. With the second-gen Chevy Volt available in some states and Nissan dragging its heels on getting a true new version of the Leaf onto dealer lots, it's no surprise that plug-in vehicle shoppers are turning to the Volt in a big way. Yes, we know that a pure EV and a PHEV are not the same and that the Volt and the Leaf are quite different cars, but after all of this time tracking the two plug-in sales champions, we feel obliged to continue our monthly look at who's selling how many of what. Here goes. We'll start with the mediocre news. That'd be the Leaf sales, which came in at just 1,054 units last month. That's the lowest monthly sales total for all of 2015 and, in fact, the lowest month of Leaf sales since February 2013. It's also a 60.8 percent drop from November 2014's sales of 2,687. This despite the fact that you can now get a new Leaf with a longer range of 107 miles (vs. 84) for a higher cost. The new Volt (along with the first-gen Volts that are still being sold out there), on the other hand, was up 49 percent, to 1,980 sales. That gave the Volt its best November ever, "on both a total and retail basis," GM says. The Volt beat the Leaf in October, too, and we suspect this is going to be the story until Nissan figures out how to get people excited about a five-year-old model or introduces the second edition. As always, we'll have a fuller wrap-up of US green car sales in our By The Numbers report soon. Green Chevrolet Nissan Electric Hybrid ev sales