Trying to make headers fit for a turbo is going to be real tight.
It can be done. In this thread, this guy has a beautiful set, but it was very pricey.
http://www.theturboforums.com/smf/the-turbo-'builds'-board/aussie-t51r-feed-202ci-holden-6/Those headers in a previous post..
Who made those & exactly what vehicle does the header fit anyways?
I think there is enough room to fit the SPA manifold.
The T4 flange that is welded to the manifold makes it an even tighter fit. They do not come that way from SPA.
You would be better off getting the SPA manifold w/no adaptor welded to it.
I believe Mike B, Mr Hotrod 6 has them?
The above pic is probably from Larry (Twisted6) or Mike B?, it's not mine. Is the eng. compartment an early Nova?
Also, with the SPA manifold, I would cut down the center devider as I suggested for Tlowe to do on his so the wastegate will see pressure/exhaust from all 6 cylinders instead of just 3 cylinders. It might not be as necessary to do since you are not bolting the turbo directly to the SPA manifold.
If not going w/the SPA maifold, I would go w/the truck 2.5" manifold. There are all different radius bends mandrel bent tubing &
possibly a 3" dount mandrel for a really tight radius, example:
http://www.theboostdepot.com/index.php?p...emart&Itemid=26MBHD
