Well, my GN was running bad. We thought it might be a valve problem but apparently a cam lobe for the #6 cylinder has flatten out. Car had 7K miles on it since engine was assembled and not alot of racing miles at all. Mechanic is not a Buick guru but thinks that maybe they didn't break the cam in properly originally. Says that to break the cam in you have to run car at 2000 RPM for 20 minutes and then change the oil & filter after letting engine cool completely down. I'm not really a guru myself when it comes to these engines. We have talked about going back with roller lifters and I assume that means using a roller cam. He said a soft cam would run about $350 max and to do the roller cam set up would be about $1K (this doesn't include labor of course). I guess with the roller cam they use hardened steel and they don't have to be broke in like the soft steel cams. The car has had extensive mods done to it and I may sell it eventually but not really sure but I want to make it right as possible. He is talking about Comp Cams. I guess I'm just looking for anybodys thoughts on any of this?? What cam (brand) anyone would recommend, roller vs soft, etc etc. Thanks, Rick