I looked up ARP rod bolts for the LS.

These it?: ARP 8740 rod bolts A 208-6001.

The stock LS B18A/B rod bolts are crap over 7000RPM or so due to them being thinner than the CTR and ITR rod bolts. Aparently they are the same bolts as the 1.2 and 1.6l econo engines.