Hey everyone. Nice to meet y'all. I just bought a 96 GMC Suburban K1500 4x4 with 200,000 miles on it. It runs great and the 4x4 operates flawlessly. I changed the engine oil, transfer case and tranny fluid and it all looks clean. It already has new ball joints and driveline universals. All it needs is shocks and tires and of course a major cleaning inside and out. I picked it up for $2500 and I figure that I'll put at least that into it for the interior and the aforementioned shocks and tires. I pulled the valve covers and see some sludge. What would be the best way to clean this up without pulling the heads? I'll post some before and after pics when I get everything squared away. Thanks! !