Marvin calls these tall claims of 600-650 horsepower on pump gas as laughable because they are not true. To make brute horsepower and torque numbers, you must have compression and abundant airflow, which translates into whopping cylinder pressure and power. You must also have octane that will stand up to high cylinder pressures without detonation. There are no free lunches, Marvin stresses, when it comes to power. You're going to have to give up one thing to have more of another and there are no exceptions. He adds if you decide to cheat and go with nitrous or supercharging, you will sacrifice durability. When you can touch a button and get 150-200 horsepower, you will hammer the daylights out of an engine, Marvin offers with a snapper.
Marvin canvassed cam manufacturers for just the right combination of lift, duration, valve overlap, and lobe centers. He wanted something off the shelf anyone could buy. He found exactly what he was looking for at Erson Cams, a drag racing cam profile that offered him the smooth combination of torque and horsepower. And had Marvin been willing to go with a custom grind, he could have improved horsepower and torque numbers significantly. However, Marvin's madness is rooted in building something anyone else could build using off-the-shelf parts readily available to anyone. In his opinion, that makes things fair.
Erson Cam Snapshot
Part Number: E212991 with 1.050-inch (small) base circle.
Grind Number: R-278-2 (Intake/Exhaust)
Lobe Separation:112-Degrees +4
Lift: 0.592-inch (Intake/Exhaust)
Advertised Duration: 278/286 ‚degrees (Intake/Exhaust)
Duration at 0.050-inch: 238/246 degrees