Hey Ronin.....did u put a block girdle in your bottom end in order to rev it up that high??..Everyone is saying the bottom end on the ls won't take it, but i have the 404's and Brian Crower personally told me that they will pull hard to 8500 rpm...my bottom end has less than 4,000 miles on it , all new bearings,type r oil pump, type r pistons, arp rod bolts, etc....what do u think?...thanks in advance...