The 1965 cars were the smallest and lightest of the GT 350 models. These cars are often called "Cobras", hich was the Ford-powered AC-based two-seat sports car also produced by Shelby American during the same period. Both models use the Cobra emblem, imilar paint scheme, nd the optional "Cobra" valve covers on many GT350s that were part of a marketing tie-in by Shelby, s well as one of his iconic symbols. All 1965-66 cars featured the K-Code 271 hp (202 kW; 275 PS) 289 cu in (4.7 L), odified to produce 306 hp (228 kW; 310 PS). Marketing literature referred to this engine as the "Cobra hi-riser" due to its high-riser intake manifold. Beginning as a stock Mustang with a 4-speed manual and 9" live rear axle, he cars were shipped to Shelby American, here they received the high-riser manifolds, ri-Y headers, nd were given larger Ford Galaxie rear drum brakes with metallic-linings and Kelsey-Hayes front disc brakes.