Super Intake Shootout

GT-40 vs. TFS R
A number of things are obvious from this graph. The first thing is that the TFS R made a great deal more power than the same motor equipped with a GT-40. Though 25 extra horsepower is nothing to sneeze at, the extra power was only available after 5500 rpm. Up to 5550 rpm, the modified GT-40 showed some pretty impressive gains from 3300 rpm all the way to 5550 rpm. Time and time again, the GT-40 continues to impress, though the TFS R intake clearly made more top-end power on this high-revving 347.

GT-40 Vs. Holley Systemax II
The Holley SysteMax bested the GT-40 by 5250 rpm, much earlier than the TFS R intake. Though the Holley offered a better torque curve, the additional torque production did not cost any top-end power. The Holley was only down by 1 hp compared to the TFS R intake. Like the TFS R, the Holley was down substantially to the GT-40 in the low and mid-range.

347 Test Motor Specs
•Block - 2-bolt 5.0
•Crank - Cast 3.40-inch 347-Coast High Performance
•Rods - 5.40-in. Steel H-Beam- (CHP)
•Pistons - Forged 10.5:1 5.0 Probe (11.5:1 with milled heads)
•Cam - XE 292R (Comp Cams)
•Lift - .621 in, .627 ex (.016, .018 lash)
•Duration - 254 in, 260 ex
•Lobe Center - 110
•Heads - AFR 185 (CNC ported & milled)
•Valves - 2.02-in, 1.60-ex
•Rockers - Comp Cams 1.6 ratio roller
•Intake - GT-40
•Throttle Body - 70 mm Accufab MAF - 77mm ProM (36 lb. calibration)
•Computer - EEC IV plus Ford Racing Extender
•Injectors - 36 lbs.-hr.
•Ignition - MSDHeaders - 13/4-inch full length Hooker
•Water Pump - Electric CSI
•Timing - 34* Total

TEST 1 -- GT-40 Intake-Baseline
•Peak Power Numbers: GT-40 Intake CHP 347-AFR heads & XE292R cam
•Peak Horsepower-GT-40 450 hp @ 6600 rpm
•Peak Torque-GT-40 447 lbs.-ft. @ 4700 rpm

TFS R INTake
Peak Power Numbers: GT-40 Intake vs. TFS RCHP 347-AFR heads & XE292R cam

Peak Horsepower -- GT-40 450 hp @ 6600 rpm * Peak Horsepower -- TFS R 475 hp @ 6500 rpm * Peak Torque -- GT-40 447 lbs.-ft. @ 4700 rpm * Peak Torque -- TFS R 422 lbs.-ft. @ 5100 rpm

GT-40 vs. Edelbrock Victor 5.0
The graph comparison between the Edelbrock Victor 5.0 and the GT-40 looks a lot like the comparison between the TFS R and the GT-40. In fact, with the exception of the extra power produced by the Victor 5.0 available from 6400 rpm to 6700 rpm, the TFS R and Edelbrock traded blows all the way up the power band. Like the TFS R intake , the Victor 5.0 lost power compared to the GT-40 all the way up to 5550 rpm. At that point, the Edelbrock stormed away in terms of power production.

TFS R vs. Holley
Note the significant humps in the torque curve offered by the Holley manifold. The Holley bested the TFS intake all the way up to 6300 rpm, where the TFS manifold took the power lead by the smallest of margins.

Victor 5.0 vs. Holley
The story was repeated in a comparison between the Holley and the Edelbrock, though the differential was not quite as dramatic as with the TFS manifold. The Holley offered more power and torque throughout the range up to 6100 rpm, where the Edelbrock turned the tables to the tune of 13 hp at 6600 rpm. It is possible that the Edelbrock intake requires an even wilder motor combination to fully realize its potential.

Holley SysteMax II
•Peak Power Numbers: GT-40 Intake vs. Holley SysteMax II
•CHP 347-AFR heads & XE292R cam
•Peak Horsepower-GT-40 450 hp @ 6600 rpm
•Peak Horsepower-Holley 474 hp @ 6300 rpm
•Peak Torque-GT-40 447 lbs.-ft. @ 4700 rpm
•Peak Torque-Holley 436 lbs.-ft. @ 5300 rpm

EDELBROCK victor 5.0

The Edelbrock Victor 5.0 posted the highest peak horsepower numbers, generating 481 hp at 6600 rpm. The 426 lbs.-ft. placed it above the TFS R but below the Holley in terms of maximum torque output.

•CHP 347-AFR heads & XE292R cam
•Peak Horsepower-GT-40 450 hp @ 6600 rpm
•Peak Horsepower-Victor 5.0 481 hp @ 6600 rpm
•Peak Torque-GT-40 447 lbs.-ft. @ 4700 rpm
•Peak Torque-Victor 5.0 426 lbs.-ft. @ 4900 rpm