![]() ![]() Throttle response is noticeably crisper, and we don't feel like we have to floor it as often to get where we are going. The truck is more fun to drive and much quicker. Now the transmission feels like an actual four-speed. We noticed an immediate improvement in on-road drivability. Our truck rolls on 37-inch tires and weighs 5,400 pounds. Our engine is backed with a stock 4L60E four-speed automatic and 5.29 axle gears. But what is more impressive is the incredibly flat torque curve that hovers around 280 lb-ft all the way up to 5,000 rpm, which makes this a great engine for towing, dirt abuse, and daily driving. Since even mild performance cams stretch the valve-lift. The biggest hurdle is accommodating valve lifts above 0.450 inch. The cam swap bumped us up to 245 hp, and with the computer tuning, we hit 268 hp. The stock Vortec springs are designed to control a very mild stock cam. That 20 percent reduction would have put our stock 255hp 5.7L at around 200 hp at the rear wheels. For our application, 20 percent is a bit conservative given the Ford 9-inch rear, tight gearing, and bigger tires, but that's what we'll go with to be conservative. However, you can generally figure on about a 20 percent loss of power through the drivetrain. Camshaft Kit, Pro LS Vortec Truck Swap, Hydraulic Roller Tappet, Advertised Duration 261/269, Lift. Unfortunately, we were unable to get a baseline on the dyno before the cam swap. Summit Racing Pro LS Camshaft & Spring Kits SUM-8719-1.
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