Black Oxide Oldsmobile Diesel Head Stud KitOldsmobile Diesel V8 (LF7, LF9)3/4 in. Hex Head and 3/16 in. Allen Studs8740 Chromoly SteelIncludes Washers Olds diesel head stud kit. Black Oxide Oldsmobile Diesel Head Stud Kit. Oldsmobile Diesel V8 (LF7, LF9). Includes Washers Olds diesel head stud kit. Around here, we don’t just sell parts – we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business – but grease, fuel, exhaust, power, and speed are what we live for. Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.