This chart is a guideline. Your stall speed MAY vary in your specific application. Expected Stall RPM

Converter Series
Advertised  
Cam Duration
Rear
Gear Ratio
Engine
Characteristics
SMALL
BLOCK
BIG
BLOCK
Street Rodder™ Stock to 260° Stock to 3.23 Smooth Idle, Stock Compression 1500-
1700 
1700-
1900 
Saturday Night Special® Stock to 265°  Stock to 3.23  Smooth Idle, Stock Compression 1600-
1800 
1800-
2000 
Breakaway® 265° to 280° 3.00 to 3.73  Fair Idle, Mild Modifications  2200-
2400 
2400-
2600 
StreetFighter™ 280° to 300° 3.55 to 4.56  Rough Idle, Large Fuel System,
Raised Compression
3000-
3400 
3400-
3600 
Super StreetFighter™ 280° to 310°  3.73 to 4.88 Rough Idle, Large Fuel System,
Raised Compression, Top End Power
3500-
3800 
3800-
4000 
Ultimate StreetFighter™

290°+  3.73+  Up to 750 HP w/ Power Adders  3500+  3800+