DIY Inlet Manifold

[Jimmyd]

Ok girls help me get this straight in my own mind.

My logic tells me that the best way for a manifold to work is to have a clear flow of the mixture from the carb into the head. Now I have 36mm bike carbs but the ports on the head are oval and are appox 35mm x 31mm. It would be way to difficult for me to make the inlet tubes match both the head ports and the carb's so does it matter if I have the manifold ports bigger than the head ports. I'm thinking this means there is an obstruction but reckon I'm thinking crap as the engine is sucking the mixture in rather than the carb blowing it in. So I can't really have the manifold ports to big the engine will only suck as much as it can through the ports in the head it's only if the air was blown in it would be an obstruction.

Does that make any sense?

Also if using a megajolt with bike carbs can you simply link the vacuum take off on the back of the carb usually used to balance the carbs or a petcock to the MAP sensor on the megajolt or do you have to have vacuum pipes in the manifold?

J