Recommended for street and strip, for big blocks only. Must have converter and gears to be streatable. Idles at 1200 RPM. Requires Notched Pistons. Stock rockers ok, TA springs recommended. Rough idle. 10:1 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: .458”
   EXH: .458”
• TA ROLLERS 1.60 RATIO:
   IN: .473”
   EXH: .473”

DURATION

• AT .050
   IN: 244
   EXH: 264
• ADVERTISED
   IN: 292
   EXH: 318

• LOBE CENTER: 107
• POWER RANGE: 3300-6000