According to The Standard Catalog of American Motors 1902-1987, the AMC V8 was introduced on March 5 (1956) in a new model called the Hornet Special. It displaced 250 cu. in. The 2 V8 engines were sold side-by-side until October 25, when the 1957 models were introduced. The 1957 cars, all of which were called "Hornets", came _only_ with the 327 cu. in. AMC V8 (the Hudson and Nash 6 cylinder engines were no longer available).
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Next up we have Hornet Six and the Hornet Twin-H Six.
The Hornet Six was a cast iron power plant and displaced 308 CID. Like all the Hudson 6 cylinders this was an in-line L-head. This had 3 – 13/16 bore and 4.50″ stroke and a compression ratio of 7.5:1 and with a two barrel Carter carb (WDG Model 2252S) it would be the Hornet down the street with 165 hp.
Here a commercial image of the Cater WGD carb.
The Hornet Twin-H Six is basically the same engine, same displacement, bore and stroke, but this was topped with 2 WA-1 Carters (Model 2113S) one barrel carbs. This set up helped it reached 175 hp.