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BY THE NUMBERS
SCOTT SHAFIROFF
RACING ENGINES
ULTRA STREET
598CI LOW-DECK
Engine type: big-block Chevy using a low-deck block
Displacement: 598 ci
Bore: 4.600 inches
Stroke: 4.500 inches
Block: Dart Big M 9.8-inch iron
Crankshaft: Eagle 4340 steel
Connecting rods: Eagle 4340 3-D with ARP L19 bolts
Pistons: Mahle forged aluminum
Camshaft type: HHR hydraulic roller upgrade
Valve lift: 0.646-inch intake/0.646-inch exhaust
Camshaft duration: 254 intake/262 exhaust, at 0.050-inch lift
Cylinder heads: Dart Pro 1 345, with CNC-porting
Intake valve diameter: 2.300 inches
Exhaust valve diameter: 1.880 inches
Compression ratio: 10.75:1
Rocker arm ratio: 1.7:1
Intake manifold: Edelbrock Victor
Recommended fuel: pump gas with minimum of 93 octane
Max horsepower: 795 at 6,000 rpm
Max torque: 768 at 4,800 rpm
Total cost as tested: $14,410
ON THE DYNO
RPM TQ HP
4,000 722.7 550.4
4,100 739.5 577.3
4,200 751.6 601.1
4,300 757.9 620.5
4,400 761.3 637.8
4,500 763.7 654.4
4,600 765.6 670.6
4,700 766.2 685.6
4,800 768.2 702.1
4,900 767.1 715.7
5,000 764.3 727.6
5,100 759.3 737.3
5,200 753.3 745.8
5,300 748.3 755.1
5,400 745.1 766.1
5,500 741.3 776.3
5,600 735.0 783.7
5,700 725.8 787.7
5,800 717.1 791.9
5,900 705.9 792.9
6,000 696.3 795.5
Scott Shafiroff Racing Engines
800-295-7142
www.ultrastreet.net
BY THE NUMBERS
SCOTT SHAFIROFF
RACING ENGINES
ULTRA STREET
598CI LOW-DECK
Engine type: big-block Chevy using a low-deck block
Displacement: 598 ci
Bore: 4.600 inches
Stroke: 4.500 inches
Block: Dart Big M 9.8-inch iron
Crankshaft: Eagle 4340 steel
Connecting rods: Eagle 4340 3-D with ARP L19 bolts
Pistons: Mahle forged aluminum
Camshaft type: HHR hydraulic roller upgrade
Valve lift: 0.646-inch intake/0.646-inch exhaust
Camshaft duration: 254 intake/262 exhaust, at 0.050-inch lift
Cylinder heads: Dart Pro 1 345, with CNC-porting
Intake valve diameter: 2.300 inches
Exhaust valve diameter: 1.880 inches
Compression ratio: 10.75:1
Rocker arm ratio: 1.7:1
Intake manifold: Edelbrock Victor
Recommended fuel: pump gas with minimum of 93 octane
Max horsepower: 795 at 6,000 rpm
Max torque: 768 at 4,800 rpm
Total cost as tested: $14,410
ON THE DYNO
RPM TQ HP
4,000 722.7 550.4
4,100 739.5 577.3
4,200 751.6 601.1
4,300 757.9 620.5
4,400 761.3 637.8
4,500 763.7 654.4
4,600 765.6 670.6
4,700 766.2 685.6
4,800 768.2 702.1
4,900 767.1 715.7
5,000 764.3 727.6
5,100 759.3 737.3
5,200 753.3 745.8
5,300 748.3 755.1
5,400 745.1 766.1
5,500 741.3 776.3
5,600 735.0 783.7
5,700 725.8 787.7
5,800 717.1 791.9
5,900 705.9 792.9
6,000 696.3 795.5
Scott Shafiroff Racing Engines
800-295-7142
www.ultrastreet.net
