Recommended for race only. Good midrange and upper RPM power. Needs all the good stuff for best performance. 4500-5000 stall converter recommended. Rough idle. 12:1 or more CR. 

Idle Quality:

Smooth Idle - just like stock
Good Idle - mild lump, but doesn’t impair driveability
Moderate Idle - nice performance sound
Fair Idle - heavy lump
Rough Idle - very lumpy race type idle
 

VALVE LIFT 

• STOCK 1.55 RATIO:
   IN: .573”
   EXH: .601”
• TA ROLLERS 1.60 RATIO:
   IN: .592”
   EXH: .620”

DURATION

• AT .050
   IN: 270
   EXH: 284
• ADVERTISED
   IN: 310
   EXH: 323

• LOBE CENTER: 108
• POWER RANGE: 4000-7000