WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Remove the cylinder head bolts.
Remove the cylinder head.
Fig 1: Removing Cylinder Head And Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the cylinder head gasket.
Remove the dowel pins - cylinder head locator, if required.