Richard Holdener
May 17, 2012

As always, the 347 stroker was given a thorough break in prior to running in anger. Jetting the Holley carburetor was made easier with the Percy’s external Adjust-a-Jet system. After timing sweeps indicated that the optimum timing was 35 degrees, we were rewarded with peak numbers of 482 hp at 6,600 rpm and 424 lb-ft of torque at 4,900 rpm. The extra displacement, cam, and compression illustrated their worth by offering a broad torque curve, bettering 400 lb-ft from 4,800 rpm to 6,100 rpm. This compares to 376 hp and 355 lb-ft of torque from the 5.0L tested previously. The original TFS-headed 5.0L managed to exceed 333 lb-ft of torque from 4,000 to 5,900 rpm, but neither the peak nor average torque production could compare to the stroker combination. Though we still had yet to max out the capacity of the 185cc Street Port Twisted Wedge Heads, this test clearly illustrated that when it comes to performance, sometimes bigger really is better.

Photo Gallery

View Photo Gallery
Here is what happens when you add cubes, cam, and compression to a 5.0L Ford. Modified by the Track Heat engine kit from Trick Flow Specialties, the high-mileage 5.0L Ford produced 376 hp and 355 lb-ft of torque. Using the same Street Port heads, the carbureted 347 produced 482 hp and 424 lb-ft of torque. Thanks to increased displacement, compression, and wilder cam timing, the 347 offered more power everywhere.