My 3.8 ecotec spun a bearing the other day on start up. And i am unsure if i want to rebuild this current engine or just buy a 2nd hand one. Or even to buy another type of engine all together. Im wondering what the cheapest option is, as i do want much more power out of my engine. And if i was to do a rebuild, are the Buick 3.8's expensive to work (E.g ACL race bearings, titanium valves..) And would it be better to buy an already supercharged engine over a a non-supercharged that i will supercharge myself.