Engine rebuild questions

[83Blzr62]

OK, I have a few questions. I am building an engine (the one in my signature). I have a gm 4 turbo and the turbo set up from a '94 6.5 truck. I want to build my own exhaust and I have access to a good welder. However, I do not know where to get the collectors for the crossover pipe and the piece that connects to the turbo for the down pipe. What size should I get for these and where should I get them? Is 2.25" tube for the crossover and 3-3.5 " for after the turbo good sizes? Also, what size fitting and hose is the turbo oil supply line and where should the supply come from on an '82 block? What size threads are the main and head bolts so I can clean out the holes with taps?

That is it for now, but there maybe more later.
Thanks for all the help,
Kyle

[DmaxMaverick]

www.summitracing.com has a huge selection of collectors, flanges, flares, tees, y's, etc. Prices aren't too bad if you shop all the brands. Are you bending the tubing, or welding it all? If welding, they also have straight pipe and mandrel bent radii.

[83Blzr62]

I am buying the pre-bent parts and wleding it together. I really just need to know what type and size of collectors for the cross over and turbo down pipe.