So excited. Just finished up putting motor back together on my 89 Chevy Silverado SS 350 after what I thought was just going to be a head gasket job. Brought the truck a month or two ago for 300. But this is what we found when we opened her up. That sludge was easy one inch thick, all over the valves, changed valve seals and mushrooms. New head bolts, new power steering pump. Just have to adjust the valves today and she's ready to fire up....I think we went through a good 12 bottles of brake cleaner.....