While it would have been nice to run the HP twin-turbo kit on the same impressive Two-Valve long-block, we built a dedicated motor for this combination. The factory '98 short-block was upgraded with a set of forged rods and pistons from Coast High Performance. The CHP kit also included a steel Cobra crank. The TEA heads were replaced with a set of CNC heads from Ford Performance Solutions. The CNC porting by FPS was applied to a set of early 2V (non-PI) heads. The early heads were then modified to allow use with the later PI intake without need of an adapter. While the PI heads are ultimately a better and more powerful choice, this conversion was an interesting alternative. The heads were equipped with a set of SI valves, a pair of XE262AH (PI-spec) cams from Comp Cams, and the PI intake. Running through an Accufab throttle body and the Hooker headers, the N/A Two-Valve motor produced 347 hp and 350 lb-ft of torque. After the twin-turbo kit installation-including a pair of 57mm turbos and an air-to-air intercooler-the peak power jumped to 713 hp and 717 lb-ft of torque. Running just 13.7 psi, this 700hp Two-Valve combination was plenty stout and was (like the other blower combinations) easily capable of significantly more.
| Specs: 700 hp |
| Block: | Stock '98 4.6L Two-Valve iron |
| Crank: | Stock '00 4.6L Four-Valve Cobra steel (stock stroke) |
| Rods: | CHP forged |
| Pistons: | CHP forged |
| Compression: | 9.3:1 |
| Cylinder Heads: | FPS CNC-ported non-PI |
| Cams: | Comp Cams XE262 AH |
| Intake Manifold: | '00 4.6L Two-Valve PI |
| Throttle Body: | Accufab 75mm |
| Inlet Elbow: | Accufab |
| Injectors: | 36 lbs, 65 lbs |
| Management System: | FAST |
| Headers: | Hooker 1-5/8-in |
| Exhaust: | Dual 2-1/2-in from turbos no mufflers |
| Fuel: | 91- and 114-octane Rockett Brand racing fuel |
| Turbos: | HP Performance twin-turbo kit (dual 57mm turbos) |
| Intercooler: | HP Performance air-to-air |
| Boost: | 13.7 psi |