 We took the liberty of upgrading...  We took the liberty of upgrading the blower pulley (from a 3.6 to a 3.4). We also upgraded the stock throttle body to an FRPP 70mm unit. The pulley and throttle-body upgrade combined with the FRPP supercharger to produce an impressive 427 hp and 425 lb-ft. |  Our 500hp combination began...  Our 500hp combination began life as a high-mileage '98 short-block upgraded with a set of CNC-ported PI heads from Total Engine Airflow. |  The PI-headed early Two-Valve...  The PI-headed early Two-Valve motor also received a set of XE274H (non-PI) cams. The XE274H cams offered 0.500 lift and a 236/240 duration split. |
 Adding the Kenne Bell 1.7L...  Adding the Kenne Bell 1.7L intercooled supercharger system to the mix increased the power output of the already impressive N/A combination (407 hp and 393 lb-ft of torque) to 574 hp and 513 lb-ft of torque at just 9 psi of boost. Actually, the boost reading at the power peak was just 8.3 psi, so there was a ton more power left in this combination. |  |  When performing the PI head...  When performing the PI head swap on the early Two-Valve short-block, we took the liberty of installing Fel-Pro head gaskets and ARP head studs-always a good idea when looking to exceed 600 hp. |
 To reach the 600hp mark, we...  To reach the 600hp mark, we started out with the same TEA-headed long-block used in the 500hp buildup. The TEA-ported PI heads offered impressive flow, thanks to full CNC porting. |  Wanting to make big power,...  Wanting to make big power, we stepped up to the T-Trim supercharger offered by Vortech. Running 12 psi through the air-to-water charge cooler, the supercharged 4.6L produced 654 hp and 547 lb-ft of torque. This power level was definitely pushing the limits of the stock short-block. |  To withstand the punishment...  To withstand the punishment of 700 hp, we took Coast High Performance (CHP) up on its offer to equip our stock short-block with forged internals. CHP supplied not only forged rods and pistons, but also a steel Cobra crank. |
 Adding the necessary boost...  Adding the necessary boost pressure to the modified 4.6L was a pair of 57mm turbos from HP Performance (Roswell, New Mexico). |  With the pair of wastegates...  With the pair of wastegates set to allow 13.7 psi, the twin-turbo 4.6L produced an amazing 713 hp and 717 lb-ft of torque. Like the blower combinations, this twin-turbo system was easily capable of much more power. | |