OptiTorque Patriot Series Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - GM Duramax HLY554-190 From our classic radiators to

From our classic radiators to all-new solutions like our hybrid inverter coolers

Gasket Ultra-Seal Head Gaskets

2-5/16 in Wide x 2-1/8 in Tall

Two 10 AN Female Inlets

OptiTorque Patriot Series Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - GM Duramax HLY554-190 From our classic radiators toProduct Description: Cylinder Head Stud Kit Patriot Series 12 Point Nuts Chromoly Black Oxide GM Duramax OptiTorque produces premium quality fasteners for a wide range of automotive applications. From stock rebuilds to hard core racing builds, OptiTorque fasteners are USA made and designed, featuring premium materials and designed to meet or exceed OEM specs.