Mad4Metal Pontiac SD-421 Super Duty Billet Aluminum Badge CNC USA

CNC Machined in the USA | 6061 Billet Aluminum | Complete Hardware Kit Included When Pontiac bored the Super Duty engine out to 421 cubic inches for 1962 and 1963, they weren't building a street engine — they were building a weapon. The SD-421 came with cross-ram dual four-barrel induction, McKellar solid-lifter camshafts, and aluminum components that shaved weight without sacrificing strength. It powered lightweight Catalinas to some of the quickest factory stock elapsed times of the early 1960s. NASCAR banned it. NHRA eventually had to create new classes to accommodate it. The SD-421 is one of the most serious factory drag racing engines ever produced, and almost nobody outside of the Pontiac community has ever heard of it. This badge is for the ones who have. This is the Mad4Metal Pontiac SD-421 badge — machined from a solid billet of 6061-T6 aircraft-grade aluminum. The SD-421 designation is CNC cut directly into the face and hand-polished to a mirror finish. No paint fill, no printing, no adhesive backing. Just aluminum and a cutting tool. Not stamped. Not cast. Not a sticker. Machined. Hardware holes bored at 2-3/8" center-to-center on 1/4"-28 fine thread. Mount it on the valve cover and it calls out exactly what's underneath — the way a Super Duty should. About the Finish These badges are polished to a mirror finish, but if you look closely you'll see the machining marks from the CNC cutting process — fine, consistent toolpath lines across the face. Those marks are intentional. They're what separates a real machined billet part from something that was painted, cast in a mold, or made to look like metal. A perfectly mark-free, glassy smooth surface would look like painted plastic. The toolpath lines catch light at different angles depending on where you're standing, and that shifting reflection is the signature of a part that was actually cut on a machine. If you want to bring up the high spots even more, a quick pass with aluminum polish will do it — while keeping the machining character completely intact. Where Can You Run It? Valve covers — passenger or driver side Engine fenders / inner fender panels Hood underside Firewall Dashboard or instrument panel Glove box door Toolbox lid Garage wall or man cave display Car trailer interior Complete Kit — Everything Included ✅ Mad4Metal Pontiac SD-421 Billet Aluminum Badge ✅ 2x 1/4"-28 Stainless Steel Pan Head Screws (18-8 SS) ✅ 2x 1/4"-28 Nylon Lock Nuts Specifications Material 6061-T6 Aircraft Grade Billet Aluminum Finish Polished — machined surface marks visible (intentional character) Height 2" Width 3" Thickness 3/16" Bolt Hole Spacing (center to center) 2-3/8" Fastener Thread 1/4"-28 Fine Thread Fasteners Included 2x 18-8 Stainless Pan Head Screws + 2x Nylon Lock Nuts Engine Reference Pontiac Super Duty 421 V8 — circa 1962–1963 Weight 0.9 oz Made In USA 🇺🇸 Why Machined Aluminum Beats Everything Else Cast zinc cracks under vibration. Plastic fades, chalks, and eventually falls apart. Stick-on emblems peel, every time, guaranteed. 6061-T6 aluminum doesn't do any of those things. It's the same alloy used throughout the aerospace industry: light, strong, corrosion-resistant, and indifferent to the temperature swings a running engine produces. When the finish dulls, you polish it back. No repainting, no replacing, no starting over. An SD-421 deserves hardware built to the same exacting standard as the engine itself. Made in the USA — Coeur d'Alene, Idaho Mad4Metal is a brand of Jacer Enterprises, LLC, operating out of Coeur d'Alene, Idaho. Every badge is designed, programmed, and CNC machined in-house — start to finish. No outsourcing, no overseas production runs, no drop-shipping. This badge originated as a custom order — if you need a different displacement, a unique graphic, or something not in the catalog, reach out. Custom orders are welcome.