Updating a 1968 cougar

Because each cylinder’s valves operated at different angles, each valve had its own pedestal.Cams for both engines were hydraulic, and the four-barrel cam was slightly hotter than the two-barrel.Interestingly, the 351C four-barrel’s rated torque output of 380 at 3,400 rpm was down from the 351W four-barrel’s rating of 385 at 3,200.The 351C found lots of applications, including an intermediate engine option on many base models, as well as being the standard engine on step-up models like Mach 1 and Cougar XR7.Starting with the already-strong 351C four-barrel, engineers gave the engine generous upgrades, adding four-bolt mains to the block and upgrading the pistons to forged aluminum.The crank remained cast nodular iron and the rods remained forged, though both ends of the crank were upgraded with a flywheel cast of high nodular iron at the rear and a larger balancer at the front.From the cylinder centerline, intake valves leaned around 9 degrees toward the intake port and around 4 degrees to the side.This allowed for slightly larger valve diameter and smoother bends in the port contours.

For 1969, that was addressed with the introduction of the then-new 351 Windsor, but Ford’s aggressive program of modernization came up with an all-new 351 just one year after the 351 Windsor’s introduction.Like the 429, which got the performance treatment after first appearing as a passenger car engine, the 351 had a hot new version for 1971.Original plans were to continue the Boss 302 into 1971, but that was scratched in the last stages of development. The 429 Cobra Jet and 429 Cobra Jet Ram Air replaced the 428 Cobra Jet as the top engine option for 1971, but the only Boss Mustang offered would be the Boss 351, built and badged around the new 351C engine.To put the new design into production, Ford spent big.“Ford Motor Company will release this fall a brand new 0 million engine designed for the 1970s,” read an August 15, 1969, press release.“A 510,000-sqare foot addition to the company’s Cleveland Engine Plant #2 was built to produce the new 351 engine.”1970: Meet the 351 Cleveland Both Ford and Mercury made heavy use of the new 351.

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