these rods found thier way into the hands of some of the best engine builders in the country, being wise and skeptical as spaz they inspected them. as purchased they found big end rod centers out of round common, up to .002 on some, bushed small end on some so tight wristpin would not install. downright sloppy clereances on such a critical part. also arp 2000 rod bolts are bottom line arp and have caused failures on lighter carillo rods on high hp builds. upgraded bolts now standard on carillo rods but not maxspeeding, upgrade bolts 50% stronger, over $250 more purchased seperatley. why stress any rod bolt with 20% more rod weight. rod weight negative stuff. beefier doesn't necessarilly mean stronger as connecting rods or bolts go, that's in alloys blended for strength, heat treating, magnafluxing, shot peening processes used. these clone rods visually may reseamble a carillo as that's thier cloned intention, but they are not by any standard. only fair to add some sets have checked out decent, but that only proves inconsistient machining/lack of final tolerence inspection. there are some sets running out there as purchased, bringing to assured higher standard with better rod bolts, big end measurement/resizing if necessary, honing of wrist pin small end, might as well buy the carillos-and add 60 grams to them. do'nt recommend rolling the dice on rod purchase.