Hydraulic Roller

Chevrolet - GM 350 LT1 - LT4 with Small Base Circle
Performance level - Stage 1 - Works well in stock or slightly modified engines.
INT/EXH - Dur @ .050” Lift: 208°/216° RR: 1.5/1.5 Gross Lift: .495”/.515” LSA: 114° RPM: 1000 to 5500 Redline: 6000

Chevrolet - GM LS1/LS2/LS6 4.8L-7.0
Performance level 2 - Increased flow or Aftermarket head required. Requires ECU tuning. Good Valve to piston clearance.
INT/EXH - Dur @ .050” Lift: 217°/226° RR: 1.7/1.7 Gross Lift: .553”/.575” LSA: 110° 

Chevrolet - GM LS1/LS2/LS6 4.8L-7.0
Performance level 3 - Great choice for bigger displacement engines. head work or aftermarket head required. Requires ECU tuning. Check Valve to piston clearance.
INT/EXH - Dur @ .050” Lift: 230°/238° RR: 1.7/1.7 Gross Lift: .600”/.5612” LSA: 110°