Quite. If you look at the cross sectional area of the inlet ports on the head they are actually quite small. The area of the point where the manifold meets the throttle body is a lot less than 2 1/2 diameter. I think I may have made my inlet "box" too big, I think it may have been better with a similar volume to the original but as I am not an engine designer I don't know what effect it will have. I drove the car briefly yesterday, it goes like stink so there can't be too much wrong :-)
Enoch
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