JBA Silver Ceramic Coated Tri-Y Headers for 1967-1970 Ford Mustang (390-428 FE), 1-3/4" x 2-1/2" - 6655SJS

Fits 1967-1970 Ford Mustang models (Base, Boss 302, Grande, Mach 1, and Shelby GT-350/GT-500/GT-500KR) equipped with 390-428 FE big block engines.

JBA Silver Ceramic Coated Tri-Y long tube headers are engineered to optimize exhaust scavenging and high-RPM efficiency for the classic FE big block. The Tri-Y design is specifically chosen to provide a broad increase in torque and horsepower across the entire powerband compared to standard four-into-one designs. These headers are constructed with large-diameter mandrel-bent steel tubing to eliminate restrictions and feature a silver ceramic coating that provides a durable, heat-resistant finish while lowering engine bay temperatures.

Installation is simplified with 3/8-inch thick CNC laser-cut flanges that resist warping and ensure a leak-free seal against the cylinder head. The integrated JBA Firecone® merged collectors facilitate smooth exhaust flow, while the design maintains maximum ground clearance for lowered vehicles. Each set includes O2 sensor provisions for modern tuning requirements.

• Part Number: 6655SJS
• Primary Tube Diameter: 1-3/4 inch
• Collector Diameter: 2-1/2 inch
• Finish: Silver Ceramic Coating
• Flange Thickness: 3/8 inch CNC laser-cut
• Construction: Mandrel-bent steel with oversized exhaust ports
• Features: Patented JBA Firecone® merged collector