Go to any engine builders seminar. You will not find any Pro builders that use gear drives. All you have to do is watch the computer simulation presented by one of the major cam companies and you will never use one again. OLD TECH.

Gear drives transmit all vibration and harmonics from the rotating assembly, directly to the already taxed valvetrain. The pushrods and valve springs look like tuning forks, high frequency vibes.

When asked, why do you still sell gear drives? Answer is always: The kids buy em!!!