From wikipedia and Saleen, Inc's website (based on the 2006 model);
The 2000-2004 S7 featured a 7.0L (427.6ci, 7008cc) N/A all aluminium OHV (2-Valve) V8. With a compression ratio of 10:1 the car made 550 HP at 6400 RPM and 525 ft-lbs of torque at 4000 RPM. The car redlines at 6500 RPM. Bore X Stroke is 4.125 x 4.00 in. (104.8 x 101.6 mm).
0-60: ~3.9 seconds
0-100: ~8.1 seconds
1/4 mile: ~11.75 @ 126 MPH (~203 km/h)
Top Speed: 210 MPH (340 km/h)
*Numbers are estimates.
2005-2006 saw the twin turbo set up with a pair of Garrett Turbochargers which bumped the horsepower to 750 HP at 6300 RPM and 700 ft-lbs of torque at the 4800 RPM line. This was at 6 psi of boost.
0-60: 2.8 seconds
0-100: 5.9 seconds
0-200: 27 seconds
1/4 mile: 10.5 seconds
Top Speed: 248 MPH (399 km/h)
In 2006 the S7 got another bump in HP to an even 1000 HP, a 33% increase. Saleen claims a top speed of 240 MPH (390 km/h) but rumors
of 260 MPH (420 km/h) are reported. 2006 also has a reported compression ratio of 11:1 and forged aluminium pistons. Camshaft and connecting rods are 4340 Forged Billet Steel. All aluminium CNC machined heads, Stainless steel with titanium retainer Valves; Intake: 2.125 in. (54.0 mm); Exhaust: 1.625 in. (41.3 mm) with Beryllium exhaust seats. Solid lifter/roller rocker valve train. 42 lb/hr fuel injectors running on 91 Octane from a 19 gallon tank. 12.6 qt High Vacuum Dry Sump oil system with an aluminium oil tank.
The Saleen S7R is "the most winning Supercar based" ever produced, which is a race modified standard, naturally aspirated S7.
A manual 6-Speed transaxle with full synchromesh, a 4-plate clutch, and a limited slip differential completes the drivetrain.
Gear ratios for 2000-2004.
1st Gear: 2.46:1
Final Drive Ratio: 3.22:1
Gear ratios for 2005-2007 changed with 1st gear and the Final Drive Ratio being steeper. All other gears dropped in ratio.
1st Gear: 2.86:1
Final Drive Ratio: 3.70:1
*Model differences only account for what's indicated, i.e., not any exterior or interior or otherwise mentioned modifications or changes.
From Modern Racer
"The S7 7.0L motor is based on the Ford all-so-common workhorse but it is all aluminium... bigger displacement and shorter overall length."
So I am going to say "no" and the Saleen S7's motor is not from any regular Ford truck, but is a specially built (modified) motor based on those motors. It is a OHV design so I am going to say it's a pushrod(?), so therefore it is not
a Modular motor.
Hope that helps answer some questions.