For 1968 only, a special, high-performance version of the 302 was offered for the Shelby GT350. Its main features included an angled, high-rise intake manifold (aluminum or cast iron), larger four-barrel carburetor, and bigger valves, 1.875 in (47.6 mm) (intake) and 1.600 in (40.6 mm) (exhaust). It had a longer-duration camshaft, still with hydraulic lifters. The block was a high-strength, "Hecho en Mexico" design, with larger, two-bolt main bearing caps. The heads and high flow cast exhaust manifolds were similar to the 289 HiPO K-code's, with small, close-tolerance pushrod holes. Heavy duty connecting rods and a nodular iron crankshaft were also included in this HIPO package. Rated power (SAE gross) was estimated at 315 hp (235 kW) @ 5000 rpm and 333 lbf•ft (451 N•m) @ 3800 rpm. The package, which cost US$692 (including some other equipment), was quite rare, and did not return for 1969.