(From Popular Mechanics)
Let's start out with the biggest numbers. And you've heard them before, the new 2009 Corvette ZR1 has: 638 hp. 605 lb.-ft. 205 mph. All this is achieved by an LS9 aluminum-block, supercharged 6.2-Liter OHV pushrod, 2-valve per engine cylinder based on the 7-liter V8 from the current Vette. A 4-lobe Eaton supercharger, in a special, ultra–low profile housing with a pair of intercoolers, boosts intake manifold pressure to a 10.5 psi max. The displacement is reduced to only 6.2 liters, because the extra torque required thicker metal in the cylinder walls and block. Connecting rods are titanium, as are the intake valves. Exhaust valves are sodium-filled for better cooling. Tired of scaring the neighbor's baby? The dual exhaust mufflers have a pair of internal valves that don't open up until wide-open throttle to free up some back pressure and deliver a much more authoritative note. Power is delivered to the rear wheels through a small-diameter twin-disc clutch, a 6-speed Tremec manual transmission and a reinforced rear end. No automatic is available.
The 2009 Corvette ZR1's frame is all aluminum, with a sprinkling of magnesium castings at critical points to add strength without weight. Brakes are massive, carbon-ceramic Brembos, which should last the life of the vehicle. The carbon-fiber front splitter mounted below the radiator inlet generates enough downforce that the front fascia had to be reinforced to prevent it from sagging and letting the splitter graze the pavement.
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