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The ports have been designed for enlargement, but only to a point. The witness grooves represent the limit on how far the LSX intake ports can be widened without worry. Great idea!
F.A.S.T. Science - LS1 Intake Manifold

 The ports have been designed for enlargement, but only to a point. The witness grooves represent the limit on how far the LSX intake ports can be widened without worry. Great idea!  View Related Article

 

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