Mr. Gasket Ultra Seal Competition Screw-In Rocker Arm Studs Features: Heat-Treated Grade 8 Alloy Steel Ex Strength Enlarged Radius More Durable/Stable Shank Prevents Stud Flexing Black Plated Finish Height: 9.60 Width: 7.60 Length: 0.70 Weight: 1.85 lbs Fitment: 1989/GMC/V3500/Sierra Classic Standard Cab Pickup 2-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated::Modification to Cylinder Head and Stud Boss Required When Replacing Studs^^1989/GMC/V3500/Sierra Classic Crew Cab Pickup 4-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated::Modification to Cylinder Head and Stud Boss Required When Replacing Studs^^1989/GMC/V3500/Sierra Classic Cab & Chassis 4-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated::Modification to Cylinder Head and Stud Boss Required When Replacing Studs^^1989/GMC/V3500/Sierra Classic Cab & Chassis 2-Door/7.4L 454Cu. In. V8 GAS OHV N...