Originally Posted by PAGregSS

I have one on my 408 and it's a great piece. I had an ASP pulley on the stock shortblock and spent the extra money for the Fluidampr and it's worth the upgrade. I don't have to worry about any harsh harmonics when revving this motor now.

Like mentioned above, there are pulleys whose purpose is to underdrive and there's true dampners. It's all a matter of what your purpose is. The Fluidampr is 10% underdriven, but does it's intended job much better.

Originally Posted by PAGregSS

I'd have to look at the documentation for the pulley to get the part number. I went with a 1" shorter belt (78").