Designing a custom camshaft is not as simple as selecting the valve lift, duration & overlap to match the engine. At Smeding Performance, we specialize and direct our focus to ensuring the correct lobe is selected for the engine’s application & combination. There are hundreds of different lobes available on the market today, each with different ramp rates. Two different lobes can have the same duration @ .050” & lobe lift, but the speed of which the lobe accelerates the lifter can...

Turbo R2: .615”/.610” Valve Lift w/ 1.7 Rocker 229/232 Duration @ .050” 114LSA + 4* Advance 1800-2200 Stall Recommended Moderate Chop Turbo R3: .624”/.615” Valve Lift w/ 1.7 Rocker 243/248 Duration @ .050” 114LSA + 2* Advance 3400+ Stall Recommended Requires Aftermarket Pistons Very Aggressive Chop

Rectangle Port R2: .615”/.615” Valve Lift w/ 1.7 Rocker 229/242 Duration @ .050” 112LSA + 4* Advance 2400-2800 Stall Recommended Moderate Chop Rectangle Port R3: .618”/.615” Valve Lift w/ 1.7 Rocker 233/250 Duration @ .050” 113LSA + 5* Advance 3400+ Stall Recommended MAX Duration for Stock Pistons w/ Unmilled Heads Very Aggressive Chop Rectangle Port R4: .624”/.615” Valve Lift w/ 1.7 Rocker 245/256 Duration @ .050” 113LSA + 5* Advance 3400+ Stall Recommended Requires Aftermarket Pistons ...

Cathedral Port R2: .617”/.614” Valve Lift w/ 1.7 Rocker 231/236 Duration @ .050” 112LSA + 4* Advance 2400-2800 Stall Recommended Moderate Chop Cathedral Port R3: .621”/.615” Valve Lift w/ 1.7 Rocker 235/244 Duration @ .050” 114.5LSA + 4.5* Advance 3400+ Stall Recommended MAX Duration for Stock Pistons w/ Unmilled Heads Very Aggressive Chop