Dyno Testing the Screamin’ Eagle SE-447 & SE-462 Camshafts for Milwaukee-8
Harley-Davidson riders looking for bolt-in camshaft upgrades often consider the Screamin’ Eagle SE-447 & SE-462 camshafts. To provide real-world performance insights, we conducted same-day, back-to-back testing on both cams using a 2020 Road Glide Special 114″ with RDRS. This test aimed to show what riders can expect when using these cams with an aftermarket tune and exhaust system.
Our test bike featured a Fuel Moto AD/DC air cleaner, Jackpot 2/1/2 head pipe, and Outlaw mufflers. Note: The tuning device and exhaust system used are not emissions-compliant and may affect or void the factory warranty.
SE-447 Camshaft: More Low-End Torque
Harley-Davidson designed the SE-447 cam to enhance torque in the low-to-mid RPM range, making it ideal for riders who want strong throttle response and better acceleration.
SE-447 Cam Specs:
Lift: .447 IN / .462 EX
Timing: IN 0/17, EX 42/5
Duration: IN 197 / EX 219
Dyno testing showed a noticeable increase in torque and horsepower over the stock cam. The Power Vision tune further optimized performance, surpassing the factory Screamin’ Eagle tune, which restricts power in several areas.
SE-462 Camshaft: Higher RPM Power, Less Torque
Harley-Davidson markets the SE-462 cam as a bolt-in upgrade for riders who prefer higher RPM power and a more aggressive riding style.
SE-462 Cam Specs:
Lift: .462 IN / .462 EX
Timing: IN 7/24, EX 53/2
Duration: IN 197 / EX 235
This cam made more peak horsepower than the SE-447 but at the expense of low-end torque. It also felt less responsive off idle compared to both the 447 cam and stock cam. The SE-462 requires higher RPMs to perform efficiently, making it better suited for riders who don’t mind downshifting frequently to stay in the powerband.
Final Thoughts & Dyno Results
Both Screamin’ Eagle SE-447 & SE-462 camshafts offer improvements over the stock cam, but their performance characteristics differ significantly.
SE-447: Best for riders wanting stronger torque and quick throttle response.
SE-462: Ideal for higher-revving power but sacrifices low-end grunt.
Below, you’ll find an overlay comparison of the SE-447 and SE-462 camshafts.
