Gold Lifetime Member
Join Date: Oct 2001
Location: Londonderry, NH
No, that really shouldn't cause any kind of performance problem, besides causing the PCV valve to pull unfiltered air into the crankcase!
And it will make the engine leak oil like a seive!
This is a very common problem on small block Chevys. Most engine builders delete this seal when replacing the intake and fill the gap with some type of silicone gasket maker. It's adhesive properties make it far more likely to stay on place over time.