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Take a look in my photos. It fit fine on my 427. More importantly, there is a chassis dyno plot of the engine with and without the K&N filter. The old filter cut 15 or 20 HP from the run. The K&N cut 1 HP. Some difference.
The only way it would make the motor sputter is if the carb was jetted wrong or they didn't re tune it for the additional air flow.
Tim
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