i420tom

iTrader: (11)

I have a pair of cast stainless steel LS exhaust manifolds. $250 shipped with heat shields. Great for a turbo kit.
And yes​​​​ gm did make stainless steel exhaust manifolds on some later models.
Magnet ​does not stick to these.

baggins

iTrader: (21)

Those don't look like zl1 or cts v manifolds.

i420tom

iTrader: (11)

They aren't, I'll post more pics when I get the motor on a stand and take them off.