BY THE NUMBERS
427CI MAST MOTORSPORTS LS3
Bore: 4.125 inches
Stroke: 4.000 inches
Displacement: 427 ci
Compression ratio: 9.45:1
Camshaft: Mast hydraulic roller
Camshaft duration: 234/254 degrees at .050-inch tappet rise
Valve lift: .648/.676 inch
Rocker ratio: T&D 1.8:1 ratio
Piston rings: Total Seal; .023, .025, .015
Piston: Mahle -25cc dish
Block: RHS standard deck
Crankshaft: Callies/Compstar forged steel
Rods: Callies/Compstar 6.125-inch H-beam
Cylinder head: Mast Motorsports LS3
Intake valve diameter: 2.200 inches
Exhaust valve diameter: 1.600 inches
Induction: Whipple 2.9L supercharger
Throttle body: Nick Williams 102mm
Engine management: Mast Motorsports M-120 EFI
Header: Mast 2.000-inch primary
Ignition: GM coil packs, NGK spark plugs
Damper: Innovators West

ON THE DYNO
427CI MAST MOTORSPORTS LS3
RPM: TQ: HP:
3,100 743 439
3,200 742 452
3,300 744 468
3,400 750 485
3,500 758 505
3,600 765 525
3,700 773 545
3,800 779 564
3,900 785 583
4,000 792 603
4,100 800 625
4,200 805 644
4,300 808 662
4,400 809 678
4,500 810 695
4,600 811 710
4,700 811 726
4,800 814 744
4,900 817 762
5,000 815 776
5,100 812 788
5,200 812 804
5,300 814 801
5,400 813 836
5,500 810 848
5,600 805 859
5,700 801 869
5,800 795 878
5,900 786 883
6,000 779 890
6,100 774 899
6,200 768 907
6,300 761 913
6,400 755 917

SOURCE
Mast Motorsports
330 NW Stalling Drive
Nagodoches
TX  75964
866-551-4916
http://www.mastmotorsports.com