That is going to be one of those areas, that at this point is not covered in the rulebook. It only covers the steel motor mounts that are bolted to the chassis & engine. Pg 47, rule #21 of the 2011 rulebook.
Since it is not covered it falls under the catch-all. It is the gray box on page 42 of the same rulebook under "legend car specs"
So, based on that they are illegal since the aluminum slugs are what USLC delivers...
Hey, if I am incorrect, give me the page number of the rule book so I can read it for myself.
Randy - RPM
