OptiTorque Patriot Series Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - GM Duramax HLY554-190 2-5/16 in Wide x 2-1/8

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

John set his engineering experience to work

For the performance-minded car owner

Engine plate and grade 8 bolts included

Two 10 AN Female Inlets

OptiTorque Patriot Series Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - GM Duramax HLY554-190 2-5/16 in Wide x 2-1/8Product 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.