Mark abused his stock 289 crank at 7500RPM for several years with no problem. They all have a life span. If you want to play with the big boys, itís going to cost you. Call Callies, Crower, or CA for the proper 289 rotating assembly. CA is only a reseller...probably of those two. Remember, NO stokers allowed. I asked Mark if he thought his original engine would still be running had he invested in a forged rotating assembly up front and he said yes. His stock 1M crank broke at the number 2 journal.