I've used CAT, Scat, Olivers, a bunch of Molnars and several sets of Ohio Crankshaft H beam rods, some with the standard 8740 ARP bolts and some of them with the better ARP 2000 bolts and several sets of Hi Po rods on motors that were going to make north of 750 HP with the L19 and one set of the Olivers with their SPS bolts, 7/16 bolt size on all of them with no real part complaints on any of them motors, not so on the owners of several of those motors, some people can screw up a 50 ton wrecking ball in a sand box with a feather