Dyers 300m rods are great,we use a lot of them.the weak link in the chain is that ARP 2000 bolt,with a yield strength of 180,000 and a tensile strength of 220,000 lbs lbs it can be a problem. after having two 2000 bolts break in a 3 week period [one on my dyno] we switched to the ARP custom age 625 with a yield of 235,000 minimum and tensile of 260,000 lbs.that has cured the problems.Bill