By The Numbers
While the naturally-aspirated version of the stealth 347 stroker made 377 rear-wheel horsepower, Paul also had the chance to dyno Dave Hale's '68 Shelby with an original Paxton supercharger bolted to the 347 package. Set at a conservative 3.5 pounds of boost, the engine generated a best of 423 hp and 404 ft-lb of torque at the rear wheels. As you can see by these numbers, the boosted stroker really starts to strut its stuff at a low 4,000 rpms.
| Dyno Results |
| RPM | Horsepower | Torque |
| 2250 | 124.9 | 291.5 |
| 2500 | 135.7 | 285.1 |
| 2750 | 169.8 | 324.2 |
| 3000 | 195.1 | 341.6 |
| 3250 | 219.1 | 354.1 |
| 3500 | 251.6 | 377.5 |
| 3750 | 283.6 | 397.2 |
| 4000 | 317.4 | 416.7 |
| 4250 | 348.4 | 430.6 |
| 4500 | 370.3 | 432.2 |
| 4750 | 389.0 | 430.1 |
| 5000 | 404.8 | 425.2 |
| 5250 | 412.1 | 412.3 |
| 5500 | 423.2 | 404.1 |
| 5750 | 406.3 | 371.2 |
| 6000 | 367.3 | 321.5 |
| 6250 | 350.8 | 294.8 |
| 6500 | 329.4 | 266.2 |
 5. One of the machine-work...  5. One of the machine-work tricks necessary to use the TFS girdleis to machine the main caps for clearance. This allows the girdle torest on the top (or center) of the main cap, providing maximum support. |  6. The power is in the heads,...  6. The power is in the heads, they say, and the TFS Trick Flowunits have sold over 60,000 castings since their introduction in 1996.In conjunction with the heads, Paul uses a Stage II TFS hydraulic rollercam for low maintenance and great performance. The cam features numbersof .557/.566-inch lift and 224/232 at 50 duration on a 112 lobeseparation. |  7. Paul Faessler works over...  7. Paul Faessler works over a set of TFS Twisted Wedges beforeinstallation on the awaiting 347 short-block. After port work, the headsare fully assembled with 2.02-inch intake and 1.60-inch exhaust valvesfrom TFS, with 10-degree locks and valvetrain components chosen to matchthe cam. Described as a Stage II port job, these heads flow 290 cfm onthe intake and 210 cfm on the exhaust at .600-inch lift. TFS 1.6 rollerrockers and chrome-moly pushrods round out the valvetrain. The completeStage II head can be purchased separately for $1,800. |
 8. An original '68 S7MS Cobra...  8. An original '68 S7MS Cobra intake was ported to flow anaverage of 315 cfm per runner with no welding. Like the rest of theengine, the intake looks stock, but it's far from it. |  9. At the wheels, the new...  9. At the wheels, the new 347 pumped out 377 rear-wheelhorsepower. Compare that to the stock Cobra 289 that came in the GT350which was good for only 190 rear-wheel horsepower. Now you canunderstand why the hottest trend in the hobby is to have a 347 indisguise! | |