I don't know where the 4.0 OHV engine gets the reputation of having more torque than the 4.0 SOHC engine. The both have the same torque at 1,600 rpm. Below that rpm the OHV engine has from 3 to5 lb-ft more torque down to 1,000 rpm. Above 1,600 rpm the SOHC engine has more torque and has close to 13 lb-ft more torque when the OHV peaks at 2,750 rpm. The SOHC engine also does not drop off as much in torque after its peak compared to the OHV.
That does not mean the OHV engine in not a good engine but does not have better torque numbers than the SOHC engine unless you want to operate at 1,500 rpm or less. Neither engines do very well at those low rpms.
This information comes from published SAE net power ratings graphs from Ford.
2002 FX4 Bright Red Supercab 4.0 SOHC, manual 5-spd & Tcase, 33" BFG MTs, K&N air filter, Modified air box inlet, Gibson SS cat. back exhaust, Bama flash, Hidden Hitch round receiver, Rear helper air springs, Electric trailer brake controller, Line-X bed liner, WAAG bar with KC lights and Wildernest shell.
Last edited by IN2 FX4; 11-01-2007 at 12:03 PM.