I have run Pete Jackson gear drives in three small block Chevy engines, and [knock on wood], I have never had a problem. Another forum memeber said he knows a guy that has upwards of 80,000 miles on an engine with a PJ gear drive, and it is still going strong. I have read all about the harmonics issue, but I have never heard a report of a hot street engine failure because of a gear drive. If you use a brand name like PJ or Edelbrock, and it is installed correctly, I don't foresee a problem. If you want the noise, I say, "go for it."