1978 Chevrolet Camaro Z28 on 2040-cars

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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.

Callaway rolls out radical Corvette C7 GT3-R at Hockenheim

Leave it to Callaway to take a badass Corvette and make it even more so. Case in point: the new Callaway Corvette C7 GT3-R you see here. It made its big debut this past weekend during the season finale for the ADAC GT Masters series at the legendary Hockenheimring – the on-again, off-again home of the German Grand Prix. Why in Germany, you ask? Because that's where Callaway Competition is based. The racing division got its start in Heilbronn as Woeher & Ciccone back in 1985. It joined with US-based Callaway Cars in 1988 to distribute its modified Corvettes in Europe, and branched out into constructing racing cars in 1994. And this is its latest project. Designed in partnership between Callaway Competition in Germany and Canadian designer Paul Deutschman, the new GT3-R replaces the previous C6-based Z06.R GT3. It packs a 6.2-liter V8 pumping 600 horsepower through an X-Trac six-speed sequential gearbox. And as you can see, it sure looks the part. Callaway will be offering the new GT3-R to privateer teams for entry in a variety of racing series around the world. But it'll also be fielding the example you see here, sponsored by Whelen Engineering that – like Callaway Cars – is based in Connecticut. Callaway Corvette C7 GT3-R World Debut at Hockenheim October 3, 2015 Hockenheim, Germany – October 3, 2015 – This weekend's ADAC GT Masters Season Finale was the backdrop for the unveiling of Callaway Competition's new Callaway Corvette C7 GT3-R. Following a brief presentation to media and invited guests, the successor of the C6-based Callaway Z06.R GT3 was displayed to the public for the first time on October 3, 2015 at the Hockenheimring in Germany. Constructors of GT race cars since 1990 and based in Leingarten Germany, Callaway Competition possesses a wealth of experience, technical know-how and a broad network of specialized professional partners. These elements were crucial to conduct such a large undertaking. After nearly two years of comprehensive planning, intensive development and expert fabrication of vehicle components, Callaway Competition completed the first C7 GT3-R just a few weeks ago. Its striking design comes as a result of the collaboration between Canadian designer Paul Deutschman and team owners Giovanni Ciccone and Ernst Wohr. Mike Gramke, Uwe Hoffmann, Florian Mohring and Andre Zanke were also heavily involved in the vehicle's development.

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