I'm looking at an 8 stack EFI system either - Eightstack or TWM.
TWM I believe use tubing that connects all the t/bs (similar to bobs pic), but it's located above the manifold, which is housed under the center pivot of the linkage below the fuel rails, to reference for vacuum pressure.
Eightstack have developed this manifold (which isn't cheap).
Not there are 8 small holes drilled (4 of which you can see) on the underside of the manifold, inside the chamber, just beneath each of the runners.
They then seal it off by screwing in the bottom plate to create a plenum for reservoir for vacuum pressure.
What I was hoping someone could tell me is what do I need to do to ensure I can create suitable and consistent vacuum pressure for reading MAP having Brake boost, to have a street-able, and easier to tune EFI system.
Engine will be 482 cubes - mild cam, but details yet to be finalized.
Open to your thoughts, knowledge and opinions.
PS: Thanks Redmt... but I need it for an FE
Many thanks,