1985 Chevrolet El Camino 305 V8, Unmolested, Original Car W/ Gauge Pack on 2040-cars

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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.

Weekly Recap: The implications of strong new car sales

New car sales are on a roll in the United States this year, and analysts are optimistic the industry will maintain its torrid pace. Sales increased 1.6 percent in May and reached an eye-popping seasonally-adjusted selling rate of 17.8 million, the strongest pace since July 2005, according TrueCar research. That positions the industry for one of its strongest years ever, as consumer confidence, low interest rates, low fuel costs, and an influx of new products propel gains. In addition to the positive economic factors, May also featured warmer weather across much of the US, an extra weekend, and it came on the heels of relatively weak April sales. Analysts suggest income tax refunds and the promise of summer driving and vacations also traditionally help May sales. "While 2015 will be one of the best years in the history of the US industry, in some ways it may be the very best ever," IHS Automotive analyst Tom Libby wrote in a commentary. "Not only are new vehicle registration volumes approaching the record levels of the early 2000s, but now registrations and production capacity are much more closely aligned so the industry is much more healthy." Capacity, an indicator of the auto sector's health, is also expected to grow. Morgan Stanley predicts it will eventually hit at least 20 million units per year, as many companies, including General Motors, Ford, Tesla, and Volvo are investing in new or upgraded factories. "The best predictor of US auto sales is the growth in capacity, and frankly, we're losing count of all of the additions – there's literally something new and big every week," Morgan Stanley said in a research note. Transaction prices, another telling indicator, also continue to show strength. They rose four percent in May to $32,452 per vehicle, and incentives dropped $10 per vehicle to $2,661, TrueCar said. "New vehicle sector and segment preference indicates consumers are confident about the economy and their finances," TrueCar president John Krafcik said in a statement. Still, Morgan Stanley noted the robust sales did little to immediately impact automaker stock prices and suggested it might be a prime time to sell if sales reach the 18-million pace. "Perhaps the biggest reason may be that investors have seen this movie before," the firm wrote.

Camo'd Chevy Camaro ZL1 is one bad boy

Thanks to a fresh gallery of spy shots, we're getting a much better look at the next Chevrolet Camaro ZL1 during its development, and this machine is looking seriously mean. Unlike the last photos, the heavy cladding is gone from the body this time and is replaced by a camouflage wrap. That switch makes checking out the details a whole lot easier. The first thing you'll notice at the front is the massive grille that looks ready to devour anything that gets in the way. To add a little more menace, the lower air dam appears to jut out a bit more, as well. While harder to see in these latest shots, our spies say the hood still boasts an extractor similar to what's found on the Cadillac CTS-V. The big, double spoke wheels look great in black and really dominate the styling in profile. Look past them, and you notice some tweaked side sills, as well. At the very back, you can also spot some styling adjustments to the rear bumper. There's an unmissable wing back there, too. The powerplant for the ZL1 is still a mystery, but it's rumored to use the LT4 6.2-liter supercharged V8. The similar hood design as the CTS-V is one piece of evidence to support that. Even with the same engine, Chevy's engineers could tweak the output higher or lower than the Caddy. The wait to find out isn't too long because the ZL1 is anticipated to launch for the 2017 model year. Related Video: