You are correct in saying this has been discussed before. To find out got to "Search" and enter the "Secret" words:....Timing...Gear...Drives.xdc351 said:This has been discussed before, I think it was these forums anyway!
If I remember correctly the standard gear drive systems bought off the shelf transmit harmonic vibration from the crank into the cam/valve gear and can cause problems. The genuine race systems are designed differently and don't have that issue but are $900+.
How much truth there is to this argument I don't know.
Personally I like the noise, for about 15 minutes, after that its nothing short of downright annoying.