Berlopez wrote on Mar 26^th, 2015 at 9:02pm:

Are there engine cowls when one reverses the engines on the 727-100 ? Berlopez

Do you mean some kind of reverser doors or something visible from the outside when the reverse thrust is activated after touch down?
As far as i know, Boeing had big problems with reverses on the 727 during the test flight program, so they designed a reverser system, which was not visible from the outside, you will only recognize the metallic grille in the cowlings.
Only the reengined 727s had a clam-shell door system on engines no.1 and no.3.
But here are some real 727 experts, they can explain much better than i can.

Matthias