| POWER CHART |
| | STOCK CAM | ERSON CAM | DIFFERENCE |
| | TQ | HP | TQ | HP | TQ | HP |
| Max Power | 399 | 326 | 419 | 403 | 20 | 77 |
| Avg. Power | 349 | 254 | 384 | 298 | 35 | 44 |
| 2,000-5,900 rpm |
| PARTS & PRICES |
| DESCRIPTION | PN | SOURCE | PRICE |
| Erson TQ40H cam | E113321 | Summit Racing | $89.95 |
| Erson hyd. lifters | E914501 | Summit Racing | 69.95 |
| Erson valvesprings | E915005 | Summit Racing | 45.95 |
| Fel-Pro intake gasket | 1205 | Summit Racing | 13.88 |
| Fel-Pro timing cover gasket | 45121 | Summit Racing | 13.99 |
| Fel-Pro valve cover gasket | 1603 | Summit Racing | 11.95 |
| Total | $245.67 |
Lobe Separation Angle TestIn another dyno flog, we tested three cams in the same small-block Chevy with the only change being the lobe separation angle (LSA). This is defined as the spread in camshaft degrees between the intake and exhaust lobe centerlines and can be determined by adding the intake and exhaust lobe centerline figures together and dividing by 2. For example: 110 + 114 = 224/2 = 112 degrees LSA. This lobe spread is designed and ground into the camshaft and can only be changed by grinding another camshaft, unless you're working with a dual overhead cam (DOHC) motor, in which case you can move the intake cam or the exhaust cam or both to change the lobe spread all you want. Regardless of engine design, this spread determines overlap, which affects idle quality, midrange torque, as well as top-end power. What the testing showed us is that a tighter lobe separation angle (like 106 degrees) was worth more average power and more peak power than a wider lobe separation angle (like 114 degrees).
It's also important to remember that LSA is a mere angle. As you add duration to the intake and exhaust lobes while retaining the same LSA, the number of degrees of overlap will increase even with the same LSA. Of course, the opposite is also true when widening the LSA. This is why you will often see bigger cams with a wider LSA, which is an attempt to limit the amount of overlap.