The straight-five produced 220 horsepower at 5,600 rpm and 225 pound-feet of torque at only 2,800 rpm. A single stainless steel fuel rail delivered fuel to the intake port-mounted injectors. These matching horsepower and torque figures would mirror changes taking place with the Vortec 4200 for the 2004 model year. He also runs Mobil 1 synthetic, taking advantage of its superior thermal stability. Wieser thinks he can squeeze 10 pounds of boost out of the turbo to make 500 hp, but he also has plans for a new, more aggressive 4200 with forged pistons, aftermarket rods, and a later '07 head that will allow him to punch the power up to perhaps 600 hp with 14 to 15 psi. [4], The LLR (also called Vortec 3700), is a straight-5 DOHC engine with dual balance shafts produced from 2007 through 2012. TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada. D. That's a Hogan sheetmetal- fabricated intake manifold that Wieser felt was necessary for better performance. CHEVROLET 4.8L/294 Pistons - Summit Racing Equipment The intake manifold was kept short in order to accommodate easy access to the spark plugs. Molten aluminum is then poured in, filling the voids left by the melting foam. It used the same 3.7-inch cylinder bore and 4.0-inch piston stroke as the Vortec 4200, along with the same rods, pistons, and valves. The 4200 also relies on an electronic throttle that Wieser has retained on his turbo version. Estimated International Ship Date: Because of the high temperatures at the piston top and the ring belt, intensive cooling is provided with oil circulating through the cooling channel. It was the first Atlas engine, and was introduced in 2002 for the Chevrolet TrailBlazer, GMC Envoy, and Oldsmobile Bravada. For a better experience, please enable JavaScript in your browser before proceeding. This is a custom order part. AUTOTHERMIK- / HYDROTHERMIK These very quiet running pistons are used primarily in passenger cars. Even the starter motor had its own mounting spot within the bell housing flange at the rear of the engine. Sutter has been involved with engine programs for the last 30 years, ranging from Oldsmobiles Quad Four to Cadillacs current V-Series mills. The Atlas program began in 1995 along with the planning for GM's next-generation mid-size SUVs and pickup trucks. As mentioned before, the Vortec 4200 was the first GM truck engine to feature variable valve timing. Find CHEVROLET 7.4L/454 Chevy big block Gen VI Pistons Forged aluminum Piston Material and get Free Shipping on Orders Over $99 at Summit Racing! Piston diameter, installation clearance, and if applicable direction of installation are marked on the piston crown. We had to find a way to run the 4WD system, yet still meet the engines oiling needs. Impressively, the oil pump moved 11 gallons a minute at 2,500 rpm while maintaining a maximum pressure of 65 psi. Need some help from one of you engine guys. This commonality throughout the Atlas family was certainly a big attraction, both for ease of manufacturing and keeping costs in check. Estimated International Ship Date: Bore, Chevy, 4.8L, 5.3L, Set of 8, Estimated USA Ship Date: From the FHR series to the LCAT, ICON offers the most diverse and fully-featured "Off the Shelf" forged piston on the market today. The episode is #40, with an air date of 5/1/2020. General Motors has a long history with making innovative strides in engine development. They have cast-in steel strips but are not slotted. Pooling fuel will seep past piston rings and contaminate the engine oil, so this was a huge advantage.
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