Chapter titles distance

Question

I am using the titlesec package to adjust the chapter titles/headings of my text. Yet, I have trouble with the resulting distance between these new titles and the body of the text. Namely, the distance becomes substantially smaller than what it is when no adjustment is made, i.e., chapter titles are the default ones.

I have noted that this decreament of the distance, probably has to do with the text body moving "upwards".

Here is what I have compiled:

\documentclass[12pt, twoside, a4paper]{book}
\usepackage{graphics}
\usepackage[dvips]{graphicx}
\usepackage{fancyhdr}
\usepackage[namelimits]{amsmath}
\usepackage[mathcal]{euscript}
\usepackage{blindtext}
\usepackage{amsmath}
\usepackage[textheight=630pt]{geometry}
\topmargin -0.1in
\setlength{\headheight}{14.71pt}
\parskip=3pt
\addtolength{\parindent}{2pt}
\usepackage{titlesec}

\titleformat{\chapter}[display]
       {\bfseries\Large}
       {\filright\MakeUppercase{\chaptertitlename} \Huge\thechapter}
       {.5ex}
       {\titlerule[.1ex]\filleft}


\begin{document}
\chapter*{Introduction}
     \blindtext[3]
     \blinddocument
\end{document}

Any ideas of how to restore this distance back to the default? The titlesec documentation is not of great help (to me at least) on this issue.

Answer 1

You have to use

\titlespacing*{\chapter}{0pt}{80pt}{50pt}

and modify the values as you wish.