Melling camshafts supply the performance to suit your horsepower and torque requirements wherever and whenever you want it. Melling high performance camshafts are developed, engineered, tested and manufactured with the highest standards of quality and materials. Listed below is a group classification for the high performance camshafts (the durations shown are based on .050 cam lift). The descriptions within each group show the characteristics of the cams in that group as well as any recommended modifications to the car or engine that will help get the desired performance.
 Heavy Duty / Performance Classifications
|
Class / Stage 1 |
Class / Stage 2 |
Class / Stage 3 |
Class / Stage 4 |
| Idle Quality: |
Good |
Fair |
Rough |
Rough |
| Torque / Horsepower: |
Low RPM torque and mid-range horsepower |
Good low to mid-range torque and horsepower |
Good mid to high RPM torque and horsepower |
Mid to high RPM torque and horsepower |
| Stock / Modified Engine: |
Will work with stock or slightly modified engine |
Will work with stock or modified engine |
May need improved carb, exhaust and ignition systems |
Need proper selection of rear axle ratio and improvements in carburation and exhaust systems |
| Transmission: |
Manual or Auto transmission |
Manual or Auto transmission |
Manual or high stall auto transmission |
Manual transmission or automatic with a very high stall converter |
| Vacuum: |
Stock |
Possibly lower vacuum than stock |
Will have lower vacuum than stock |
Will not have enough vacuum for power accessories |
| Power Range: |
1200 - 4000 RPM |
2000 - 4800 RPM |
2200 - 5600 RPM |
3200 - 6500 RPM |
| Duration (based on .050 cam lift): |
200° - 215° |
215° - 230° |
230° - 245° |
Over 245° |
| Best For: |
Towing / Plowing / RVs |
Street-Legal Hod Rods |
Combination Street / Drag Racing |
Serious Racing |
|
