StopTech seems to think monoblock calipers are worse than 2-piece calipers bolted together with steel bolts.
http://stoptech.com/technical-suppor...s-2pc-calipers
Wilwood says the same thing:
Quote:
Q: Which is the more ridged Caliper, a two-piece or a monobloc?
A: Everything being equal, a properly designed two-piece caliper will flex less than a monobloc caliper. Stiffness is a function of the material’s modulus of elasticity. Steel bolts have an elastic modulus approximately three times that of aluminum bridges. There are some exotic aluminum alloys that were developed for F-1 racing that have almost the same elastic modulus as steel; however, they are expensive and not normally seen in after market brake kits. Steel has the added benefit of not losing its elastic modulus as things heat up. As a matter of fact, steel’s elastic modulus actually increases in stiffness as temperatures rise above 200 degrees F by approximately 30 percent, where it stabilizes at 400 degrees F. Aluminum on the other hand, loses approximately 50 percent of its stiffness by 300 degrees F.
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http://www.wilwood.com/m/techtip/Tec...aspx?id=4&no=3
Very few high end calipers are monoblock these days... interesting that the PFC one is. Definitely report back how these work.