Hmmmm...I think were on the same wave length here?
--------No Problemo---------
Intake port-
Intake port-Manifold runner
Intake port-Manifold runner
Intake port-Manifold runner
Intake port-
----------------------------
--------Problemo------------
Manifold runner
Intake port-Manifold runner
Intake port-Manifold runner
Intake port-Manifold runner
Manifold runner
----------------------------
If what your saying is, the intake port has been opened up a bit larger than a 1262 gasket size port, then you shouldn't have any problems with flow through the manifold to the intake port (reference my cheesey drawings above), it will have little or no effect of airflow
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