Port on TB flange

KidnKorner said:

What is this port for and is it necessary? I have always been told its the IACV port.

Sorry if it seems like a moronic question but I have a customer considering the new RRC manifold which does not have one and I don;t want him to get stuck with a manifold he can not use or has to buy something expensive to make it work.

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If you're going to add a spacer in order to adapt the 02-04 K20A2 throttle body, than I would just add a port in the spacer and that's the end of it.

KidnKorner said:

The pic show is an RBC manifold, and the answer you gave I already knew but this thread isn't about that. I sell about 10 RBC kits a week and all I wanted to know is if the IACV port was necessary and can it be eliminated..

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If it's for a street car, than the IACV is needed for the engine to idle properly.

If you're going to install a RRC intake manifold, than you will make a adapter plate to install your 02-04 K20A2 throttle body and on this spacer you will drill and tap a fitting in order to re-introduce a IACV passage way to the RRC intake manifold.

xtrafastcrx said:

Completely false.

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If you want a stable idle between 750 and 850rpms you need a IACV in the equation. Also, if it's a street car and is used in temperatures below 40F, you need the IACV.