Tag: 409CID

The Hi Po 289 CID V-8 and Shelby’s Mods

The Mustang 289 CID High-Performance V-8 (“Hi-Po”) developed 271 horsepower. It’s weight per horsepower was less than two pounds, an excellent figure, as lighter, more powerful engines helped not only straight line performance but handling as well. The horsepower per cubic inch of displacement of 0. 95 was close to the the 1960s benchmark of 1.0 set earlier by the original 1957 283 CID fuel injected Corvette V-8.

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