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.

Last edited by bigsbigelow; 10/02/09 06:52 AM.
Ryan "Bigs" '73 Duster (BLKDUST) - Black, 100% factory sheet metal, flat hood, 346 cid, J Heads, and a bench seat. http://s268.photobucket.com/albums/jj1/bigsbigelow/ Best to date: 12.40 @ 109 mph