OptiTorque Patriot Series Main Stud Kit - 12 Point Nuts - 4-Bolt Mains - Chromoly - Black Oxide P1FK050-H02E why is Arai alone responsible

why is Arai alone responsible for such comfort and fit advances as different interior shapes to fit different head shapes

290 in Single Spring

1988-1988 Chevrolet K1500

Using the Centerforce centrifugal weights (where applicable)

OptiTorque Patriot Series Main Stud Kit - 12 Point Nuts - 4-Bolt Mains - Chromoly - Black Oxide P1FK050-H02E why is Arai alone responsibleProduct Description: Main Stud Kit Patriot Series 12 Point Nuts 4 Bolt Mains Chromoly Black Oxide GM LS Series Dart Block 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.