5.0L Performance packages-347 Stroker
5.0L-Stock vs. Modified 347 EFI
Since the power output of any combination is a function of the major components and the displacement, an easy way to improve power without resorting to decreased driveability is to add cubes. Remember, there really is no replacement, especially when it fits conveniently in the same physical package as the stock 302. The 347 is a common stoker assembly, and our test components were supplied by Scat and JE pistons. Forged components ensured plenty of strength, since we later ran both boost and nitrous on these 347 combinations. The injected version was equipped with a set of CNC-ported heads from Procomp Electronics, a healthy Crane hydraulic-roller cam (0.563/0.584 lift, 232/240 duration, and 112-degree LSA), and Edelbrock Performer RPM II upper and lower intake. Also present were a set of Hooker Super Comp headers, complete Aeromotive fuel system feeding 36-pound injectors and an Accufab 75mm throttle body. Thanks to tuning from the Holley management system, the injected 347 combination produced 462 hp at 6,200 rpm and 435 lb-ft of torque at 4,500 rpm.
5.0L Stock vs. Modified 347 Carb
Once again we employed a 347 stroker assembly, but this one came in the form of a Dart SHP stroker assembly. The SHP motor combined a 4.03-inch bore with a 3.40-inch stroke. The flat-top (Mahle) pistons were combined with a TFS Stage 3 hydraulic-roller cam that offered a 0.574/0.595-lift split, a 236/248-duration split (at 0.050), and a 110-degree lobe-separation angle. The combination was also topped off with a set of CNC-ported Twisted Wedge CNC 185 cylinder heads from Trick Flow Specialties. Topping the combination was an Edelbrock Performer RPM Air Gap intake and 750 HP Holley carburetor. As with the 302 combinations, the carbureted 347 combo produced slightly more peak power than the EFI version, but slightly less peak torque. This carbureted stroker produced 482 hp at 6,600 rpm and 424 lb-ft at 4,900 rpm. Approaching 500 hp, this 347 is a healthy street motor but one with a nice, broad torque curve.