05-23-2019, 08:35 AM
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Senior Member
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Join Date: Mar 2017
Location: ABQ, New Mexico
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The Chevy MK II 427 "Mystery Engine" was never developed for Drag Racing. It was strictly for NASCAR stock car racing and premiered at Daytona 1963. Drag racers had the 427 Z11 - the engine created from the MK I 409.
Just a bit of trivia: the MK II 427 was the first Chevy engine to use a Holley carb as it's float design was superior to that of the Carter AFB, what Chevy was using on all of it's engines with a 4 BBL carb.
Though it says " 427 HP" on the hood, the MK II 427 put out about 540 HP in race tune. More than 100 HP improvement over the MK I 409 which Chevy was using for NASCAR in 1962.
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