Rb25 Inlet Manifolt Port Matching

[Space Goat]

hi,

im in the process of port matching an rb25 inlet manifold however i noticed just before each pipe goes into the head, there is a small tear drop shaped bump... it has kinda sharp edges, sits 1mm high and doesn't look like its been put there by mistake. it is in the same position on every pipe... any insight into what i should do... im more leaning towards leaving it might have something to do to help the air swirl before the fuel hits it so it can atomize better???

p.s. im not talking about the bump that is the shape of the inlet pipe if you rub inside the pipe you will feel it

cheers Rick

[h2k]

hmm...It would help with a picture