By The Numbers
427ci Windsor Ford Arias Hemispherical Head Conversion
Bore: 4.125 inches
Stroke: 4.00 inches
Displacement: 427 ci
Compression ratio: 14.4:1
Camshaft: Contreras solid roller
Camshaft duration: 268 degrees at .050-inch tappet rise
Valve lift: .810 inch
Rocker ratio: Arias rockers; 1.82/1.75:1 ratio
Piston rings: Total Seal
Piston: Arias
Block: Shelby Aluminum Windsor
Crankshaft: Scat
Rods: Carrillo
Cylinder head: Arias Windsor Hemispherical
Intake valve diameter: 2.250 inches
Exhaust valve diameter: 1.600 inches
Intake manifold Edelbrock
Carburetor: Holley 1,150-cfm Dominator
Header: SPD 2-inch primary
Ignition: MSD Digital 7 and crank trigger
Damper: ATI
Fuel: VP Q16

RPM TQ HP
3,500 445.3 296.7
3,700 485.7 342.2
3,900 509.8 378.5
4,100 529.2 413.1
4,300 540.7 442.7
4,500 543.1 465.3
4,700 550.0 492.1
4,900 567.6 529.6
5,100 584.4 567.4
5,300 598.6 604.0
5,500 606.7 635.4
5,700 609.1 661.1
5,900 608.3 683.3
6,100 605.7 703.5
6,300 601.9 722.0
6,500 593.6 734.7
6,700 584.3 745.4
6,900 569.3 747.9
7,100 551.5 745.6
7,300 532.1 739.5
7,500 516.4 737.4

SOURCE
LTR Racing Engines
760-378-1982
Carroll Shelby Engine Co.
310-538-2914
www.ShelbyEngines.com
Nick Arias Jr. Racing Components
310-323-7223
www.NickAriasJr.com