# Why do I get this undesired vertical space between “chapter #” and Chapter Heading?

In my document, one of my chapter title lasts more than one line, so I want to increase the space between its lines. To do this, I used \linespread{1.8}\selectfont in the code below, but by using that, the space between "Chapter #" and the Chapter Heading increases, too. How can I avoid this latter undesired space? By the way, I'd prefer not to use additional packages like titlesec or setspace.

\documentclass{book}
\makeatletter
\vspace*{50\p@}%
{\parindent \z@ \raggedright \normalfont
\ifnum \c@secnumdepth >\m@ne
\if@mainmatter
\huge\bfseries \@chapapp\space \thechapter
\par\nobreak
\vskip 20\p@
\fi
\fi
\interlinepenalty\@M
\vskip 40\p@
}}
\makeatother
\begin{document}
\chapter{Chapter Heading which is very very very long}
Some text ...
‎\end{document}‎

-

It doesn't! In your code you have a vskip20\p@ and this remains constant. (See the below minimal, where I zeroed it.

\documentclass{book}
\makeatletter
\vspace*{50\p@}%
{\parindent \z@ \raggedright \normalfont
\ifnum \c@secnumdepth >\m@ne
\if@mainmatter
\huge\bfseries \@chapapp\space \fbox{\thechapter}
\par\nobreak
\vskip 0\p@
\fi
\fi
\interlinepenalty\@M
\vskip 40\p@
}}
\makeatother
\begin{document}
\chapter{Chapter Heading which is very very Hery long}
Some text ...
‎\end{document}‎


Also don't forget to modify the star version of the command using \@makeschapterhead

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So I should use \parbox command to control the scope of \linespread{1.2}\selectfont, right? –  Vahid Damanafshan Feb 16 '13 at 20:43
@VahidDamanafshan It is easier to adjust with a negative skip to suit e.g.\vskip-30pt on line 10. –  Yiannis Lazarides Feb 16 '13 at 20:50