Robert_Charlton - 12:50 am on Jun 25, 2013 (gmt 0)
I think its just the opposite, too many good links that are dubious will trip the algorithm or 2 many good links from the same c-class will do it also.
"Too many 'good' links" that are 'dubious' sounds like there's some confusion about what "good" means. "Dubious" links are never "good" links.
Similarly, multiple links from the same class C are likely to be under coordinated control, which essentially (by Google's definition) means that there's something spammy about them.
"Good" links in Google's eyes are freely given editorial links.