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...From the book 'Ford Performance' by Pat Ganahl: For the 351 Cleveland. For Drags and Circle Track; Primaries at 2 1/4" O.D.(2.0" I.D.) 34" Long, with the Collector at 3 1/2" O.D to 4 1/2" O.D... For STREET Use: Primaries at 1 3/4" to 2.0" O.D. 40 Inches Long, NO Collector size Mentioned! Go with 3.0" to 3 1/2" O.D...
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