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14 Because the heads simply flowed too much air for the 432-inch combination, the intake ports were filled in with Z-Spar to restrict airflow by about 35 percent. But even with that, the heads flow about 416 cfm and could benefit from about 100 additional cubic inches to fulfill their potential. Bottom line: The stock Boss 429 had way, way too much cylinder head for the street. View Related Article
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