Aluminum Header Block-Off Plate | M/T Style Exhaust Header Cap (4-Hole Pattern)

Aluminum Header Block-Off Plate – M/T Style (4-Hole Pattern) Cap your headers with a piece of hot rod history. This aluminum header block-off plate is cast from the original 1960s Mickey Thompson “M/T” pattern, delivering authentic vintage styling for traditional builds, nostalgia drag cars, and classic muscle projects. Designed with a dimpled 4-hole pattern, this exhaust header cap can be drilled to match most common header flange bolt layouts. Whether you're sealing off open headers for tuning, transport, or storage—or just adding a period-correct touch to your garage wall—this piece delivers timeless character. Functional, collectible, and unmistakably traditional. Fitment & Use Designed to block off most standard 4-bolt header flanges Can be drilled to match various exhaust flange bolt layouts Ideal for temporary header sealing, dyno work, or display Also popular as: Garage decor Shop display piece Unique hot rod gift Key Features Cast from original 1960s M/T header cap pattern Dimpled 4-hole design Diameter: 4-1/4" Thickness: 5/16" Shot-peened matte finish (polishing optional) 356 heat-treated sand-cast aluminum (not die-cast) What’s Included (1) Aluminum header block-off plate Finish Options Polishing available (adds additional lead time)   Manufactured in the USA   This M/T style header block-off plate is perfect for nostalgia drag builds, gassers, traditional hot rods, and vintage muscle cars. Use it to seal open exhaust headers or display it as a tribute to 1960s performance history. Frequently Asked Questions Will this fit my headers? This plate features a 4-hole dimpled pattern and can be drilled to match most common header flange bolt layouts. Is this functional or decorative? Both. It can be used to temporarily block off exhaust headers or as a display piece for garage decor. Is this cast or billet? This header cap is manufactured from 356 heat-treated sand-cast aluminum. Is it sold individually or as a pair? It is sold individually.