Slant 6 Headers

I also believe those are truck headers due to the length of the tubes.
I am not sure about 170's needing "special" headers. I think Clifford shortie headers are made to fit all three slant sixes (170-198-225). Though clifford has become unreliable lately when it comes to getting parts in a timely manner.
The person you need to talk to is Charlie S. Send him a PM he runs 170's in at least 2 but I think it is actually 3 cars.

P.S. you english is just fine:smile: