Compatible with 68-74 Chevy/GMC 1/2, 3/4 & 1-Ton Truck, 68-74 Blazer/Yukon/Jimmy/Suburban/1-Ton Crew Cab: 396-502 Tube Size 2 in. x 35 in., Collector Size 3.5 in., Collector Length 10 in., Port Shape: Same As Port; Hooker has long been known for its dominance of the drag racing circuit, but did you know that Hooker can help the off-road enthusiast scorch the deserts, mountains and swamps of the world? Hooker Headers use long tube lengths and long transition collectors to produce monstrous lowmid range torque without sacrificing top end horsepower. Each Hooker header is designed to provide the finest fit and most durable construction available on the market today.