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Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

2019 GMC Sierra CarbonPro Edition pricing starts above $65,000

GMC is hard at work building carbon fiber beds for its CarbonPro trucks, so it's fitting that the company has finally released pricing for the 2019 GMC Sierra CarbonPro Edition. It's not cheap by any measure. The most "affordable" for 2019 is the AT4 version starting at $66,635. It's also available in Denali trim, and that version starts at $70,020. Both represent an increase of $8,000 to $9,000 more over the base AT4 and Denali models. That may seem like a lot to go from a steel bed to a carbon fiber one, but you're getting more than the bed for that money. GMC also includes unique badging, a Bluetooth bed speaker, rear-camera mirror, surround vision cameras, automatic emergency braking, lane-keep assist, automatic headlights, power side steps, a sunroof, trailer tire pressure monitoring and a color heads-up display to both models. The AT4 specifically gets a Bose sound system, navigation, parking sensors and a cat-back exhaust, too. The Denali adds unique 22-inch wheels. Both only come with the 6.2-liter V8 and 10-speed automatic. To equip a regular GMC Sierra AT4 similarly to the CarbonPro Edition, the price comes out to $64,110. The Denali comparably equipped to the CarbonPro is $67,940. So the bed itself is about $2,000 to $3,000. The 2019 GMC Sierra CarbonPro Edition trucks should be reaching dealers very soon. They will soon be supplanted by the 2020 version, which will add the new 3.0-liter diesel inline-six as an engine option. The AT4 CarbonPro will get some extra black accents for 2020, too.

eBay Find of the Day: 1976 GMC Motorhome is a jolly green giant

If you have a need to relive the 1970s, then here is the vehicle for you. This groovy blast from the past is a 1976 GMC Motorhome currently for auction in Florida on eBay Motors, and it is one green machine - just not in the modern sense.
The seller claims that this beast has had just two owners and has covered a mere 61,308 miles in its decades on the road. It's reportedly never been restored or repainted and comes with all of the necessary books and manuals. A 7.5-liter (455-cubic-inch) Oldsmobile V8 with a three-speed Turbo-Hydramatic automatic transmission powering the front wheels propels this far-out RV, and the double set of rear wheels out back use a self-leveling air suspension to provide a cushy ride.
The purported low miles and good condition really make this GMC a stand out, though. The exterior combination of lime stripes and beige with just a touch of green is like nothing else on the road today. Plus, the polished bumpers and wheels make it all pop. Inside, it's even better with monochromatic green upholstery and shag carpet. It features everything you'd ever need on a long trip, including a bathroom, kitchenette and lots of seating. The only hint of modernization is an HD TV next to the stove, but its size is a perfect fit for the hole there.