Was browsing youtube this evening and stumbled across this video series. This gentleman was kind enough to film the entire process of headgasket and timing chain replacement on his 1998 Aurora. The video series covers from the very start of engine removal, through drilling and tapping studs from Northstar performance, right up to starting it up again afterwards. It's an interesting watch regardless of whether you need to complete the job or not. Give this guy a thumbs up on his videos and subscribe!