Pro-Race and Pro-Sport are sold under Summit label also Ford Racing balancer is Pro-Race a US company that has a PRIMARY business of selling dampers they manufacture themselves here in USA! I'd say quite comparable to an ATI.
Scat website had a note on broken crank snouts they mention crank balancing with Fluid dampers or rattler type as being difficult to impossible among other causes of crank snout failure. (Loose fit another BTW)
Problem I see with viscous fluid dampening is at what point is the fluid the correct viscosity for a given harmonic at a particular rpm (I'm certain it wont be the same constant) and the ability to stay at that viscosity??? Think about that long and hard. How do you accurately insure balance on a rattler that has parts that wobble or a fluid damper that is always off balance when stationary??? Can you balance a crank in longitude instead of lateral and expect it to be same when used in lateral. (same difference between static vs dynamic tire balancing) Dont think its not important to balance a rotating assembly with all attached parts including pulleys??? Maybe not critical in under 6000 rpm applications with a shorter stroke motor, but with a longer stroke 6000 rpm could be critical!
I have to say I was going to use a rattler till I did some homework when it came time to buy one for my Ford. Its still better than a viscous damper IMO but I'm glad I researched further.
BTW on the 460 ford site ProProducts and Pro Comp(somewhat) ANYTHING is like a running joke when it comes to parts selection. They suggest you get your GM and Mopar buddies to use that stuff. (any of it) What Ive seen of it, I wouldnt want on anything. Why some Pontiac vendors are selling it is beyond me.
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