Another itb question

[driftwood]

I'm trying to make an inlet manifold for an itb set up. How far away from the head/inlet valve should I mount the throttle bodies?

[HairyScreech]

Depends on a few things, what size are the bodies, what length inlet runners are you planning on using (total length), what engine are they going on, can and compression?

[driftwood]

I'm planning on using 38mm throttle bodies. The total length of the intake will depend on what clearance I have. The engine is a standard 2.5 at the moment but will eventually be tuned. The plan is to get it working and then spend money on the motor. I want to mount the throttle bodies as close to the head as possible so that I have plenty of scope when trying to find the length that works best. How close is too close?

[Gunni]

Also what cam are you going to use, and it´s timing?