So to highlight some of the fuel rail questions someone replicating my setup may have, I'll answer them with my solution for my setup, which maybe different than yours.
I'm running STS V injectors (50lb) which are a fantastic upgrade for not a lot of cash.
They are somewhat taller than the ls6 length injectors and much taller than the LS2 length injectors. I used the stock LS2 rails.
To for them properly so the retaining clips fit as they should, I had to use a spacer on each rail.
Luckily I had a full set of extra hardware from my previous fast 92, and the washers for the mounting bolts are exactly the right fitment when placed below the rail. It's about a 1/4" thick spacer.
You can mount them without the spacers, but I observed that as I tightened up the mount bolts, the upper shell would pop up a bit. I found that it put too much additional tension for my taste on the entire manifold as this could cause leaks later on down the line.
One can overcome this difficulty by installing and torquing the hardware prior to installation of the injectors and rails. But I am unsure of the injector safety clips would seat properly, and you may also observe upper shell deformation as I noted.
Just things to keep in mind if you are doing this particular combination.
I believe this sums up the non written knowledge that is not contained in the manual that comes with the manifold.
-Byron
