You've still not suggested what to do to match the head to the ST170 manifold. What your suggesting still leaves a step, just top and bottom instead of at the top. The proper way to do this is to blend in the port on the head. Thanks, but I don't need a picture as I've had quite a few heads and manifolds (including 4 different 2.0 Blacktops, WRC, Rover, FR) pass through my workshop, all fully recorded.
I think its common knowledge amongst those who have spent a bit of time playing with Blacktop engines that the ST170 TB does not fit a standard manifold. Apart from it not really being necessary,the obvious alternative is the FC/Steeda/CFM/PS 65mm one (NOT JR).
I'm just guessing but I recon a 170 manifold will flow better than a 130 manifold considering they are both zetecs!
Why ? The main reason is simply to provide DSI (how are you going to operate that?). Actually measuring an improvement is a bit better than intuitive guessing.
Again, anyone who does their research knows the ST170 uses a non-return fuel rail, so obviously a standard one is a good idea with a more common management system. But why a 'Power Boost Valve' ? they only have any effect on a very early management system as any decent ECU senses and corrects injector pulses for variation in rail pressure. For 99% of applications,the standard Ford PCV is perfectly adequate. If you really want something else, a normal 1:1 regulator is fine.
Martin