Harmonic balancer
Rip
Where did you hear the fluid would not react well to road race conditions?? I've not heard that, and I have a March sittin on my floor waitin to be installed with my cam.
Also, why not an underdrive pulley? It frees up horsepower, lets your motor spin more freely. No downsides that I can see unless you're going to be running a massive sound system, and there are ways to facilitate too.
If you are dead set on a stock size, contact ATI, they can custom build you a pulley for a pretty price.
Even with the under drive I never had or noticed any problems. Revs did come up a bit .


