Reply To: Customize Header Image Height

Take a look around line 683 in your css for this –

.header-image #title,
.header-image #title a,
.header-image #title-area {
display: block;
float: left;
min-height: 140px;
overflow: hidden;
text-indent: -9999px;
width: 50%;
}

You can change the width to around 67% or so and that should cover it.