SBC ULTRA connecting rods in stock! Posted on November 2, 2010January 9, 2017 by calliesadmin 11.02.2010, Callies now has Small Block Chevy Ultra connecting rods in stock! The first sets of 6.000 2.100 are ready to ship. Contact your Callies representative for more information. Posted in News and tagged Callies, Callies Performance Products, Connecting Rods, SBC, Ultra Connecting Rods.