My grandfather has the MP 406 LA stroker in his Demon. It will run on 87 with no apparent knock. We normally use 93, though, because we haven't had time to dial in the timing to use 87 and feel safe doing it. <img src="/ubbthreads/images/graemlins/Twocents.gif" alt="" />
IIRC, those are 9.0 to 1 compression and big cams that would bleed compression too.
