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Buick Avenir concept struts into Motown

We love auto show surprises, and Buick has already gifted us a sparkly package on the eve of the 2015 Detroit Auto Show. Dubbed Avenir, this four-door concept is said to signal the future of the Trishield brand by previewing a possible flagship sedan. Incorporating time-honored Buick design hallmarks like the sweep-spear profile, Ventiports, and even a subtle boattail rear-end, the four-place sedan is powered by a surprisingly real-world powertrain – namely a next-generation V6 with cylinder deactivation and stop/start, with the most interesting part of the driveline arguably being a "twin-clutch all-wheel-drive system" and a nine-speed automatic gearbox with paddle shifters. Make no mistake, this is a big car. At 204.5 inches long, it's longer than a standard-wheelbase Cadillac Escalade – a span that's emphasized by the car's long hood and waterfall grille – though it's not quite as wide. While clearly a showcar, the beautifully crafted interior looks largely produceable, including attributes like a next-generation 12-inch touchscreen infotainment system and 4G LTE wifi, but we suspect a production car would pick up a third rear seatbelt and give away some of its flowing contours that are said to have been "inspired by nature and sea waves receding on a beach." No word yet on whether there's actually a showroom future for a car like this – it could simply be an exercise designed to test the waters for a next-generation LaCrosse. After all, sedans aren't exactly popular concept fodder these days, especially as crossovers continue to eat into traditional sedan sales in many of the world's markets. However, China still loves the coddling rear seats of a proper four-door sedan (which in this case include silk and bamboo elements), and with a majority of Buick sales happening in the People's Republic, the Asian nation controls the destiny of this General Motors brand. Said another way? Anything is possible, especially with General Motors known to be working on a large flagship sedan for Cadillac already – the Avenir is reportedly based on the same Omega architecture that will underpin the forthcoming CT6. What do you think? Is this a promising direction for the resurgent Buick? Scroll through our gallery, check out the video, and then have your say in Comments.

Question of the Day: Best recipient for supercharged GM V6?

The good old Buick V6 engine was built from 1961 through 2008 (including a decade of production by Kaiser-Jeep) and went into way too many General Motors vehicles to list here. In 1991, the supercharged version of the 3800 was introduced, with a Roots-style Eaton blower on top, and now you can find these engines in just about every junkyard in North America. The 3800 shares a bellhousing pattern with the also-made-by-the-zillions GM 60° V6 engine, which means that it will install (with varying levels of sledgehammer clearancing and/or axle mix-and-matching) into plenty of GM vehicles that never received the 3800 from the factory. That means one thing: engine swaps! An excellent example of this is the 1992 Chevrolet Lumina APV "Dustbuster" minivan, which is a fully caged high-performance road-racing machine that features a supercharged 3800 and 5-speed manual transmission under its long, vacuum-cleaner-snout-like hood. The RaceVan, in Springfield Monorail livery, will compete this weekend at the Michigan 24 Hours of LeMons race with Autobloggers Mike Austin, David Gluckman, and Alex Kierstein at the wheel. My personal choice for supercharged 3800 power, though, has to be the Cadillac Cimarron, preferably the not-so-sought-after Cimarron d'Oro Edition. Some bashing and welding and cutting and pasting and this lightweight Cavalier sibling could have well over double its original horsepower. So, what's your blown 3800 engine-swap choice? Related Video: Auto News Buick GM v6 question of the day questions engine swap

Buick Blackhawk concept headed to auction block again

While the collector car auction market is often criticized for inflating the price of vintage models out of the realm of affordability for many buyers, these sales do give us an opportunity to look back on some of the beautiful, rare designs of the past. Just take a glance at this Buick Blackhawk concept with a shape right out of the '40s or '50s. Despite the heritage styling, it was pieced together from older pieces for Buick to celebrate itself in the early 2000s With styling inspiration from the classic Buick Y-Job concept car, the Blackhawk mixes actual vintage components to create its curvaceous shape. However, the power retractable top is thoroughly modern being made from carbon fiber and stows in the deck lid when the roof needs to go down. After so much work on the outside, the Buick has something equally surprising under the hood. It's a 1970 455-cubic-inch (7.5-liter) V8 GS Stage III V8 with a claimed 463 horsepower and 510 pound-feet of torque, and for easy cruising the mill is linked to a four-speed automatic. Built in-house by Buick, the Blackhawk was once part of the General Motors Heritage Fleet, but the automaker sold it off in 2009 at the Barrett-Jackson auction in Scottsdale, AZ, along with many other members of the collection. The concept went for $522,500 after the buyer's premium, according to the auctioneers. Now, it's crossing the block again with no reserve as part of RM Auctions sale of the Andrews Collection on May 2, 2015, in Fort Worth, TX. The 75-car auction also includes highlights like one of seven 1962 Ferrari 400 Superamerica SWB Cabriolet models bodied by Pininfarina. Featured Gallery Buick Blackhawk Concept News Source: RM Auctions, Barrett-Jackson AuctionsImage Credit: Darin Schnabel Courtesy of RM Auctions Design/Style Buick Auctions Convertible Concept Cars