By "cylinder heads slipping" do you mean if a cylinder liner has shifted? If so, than I think you can tell with the head off. Basically you have an aluminum block and head to save weight and steel liners are set into the aluminum block because obviously raw aluminum would wear and melt if a steel piston was churning inside it at 3,000 RPM's. This engine is a Buick / GM design of the 1950's and so that was the thinking at the time. The liners are simply pressed in at the factory, and not held by any other means. I have heard it is very common on the 4.2 for these liners to shift more so than on the other iterations of this engine (3.5, 3.9, 4.0, 4.6) With the head off, you should clearly see the liner sitting inside the cylinder bore tight to the walls. If you can pull on it and it moves, you're in trouble. Some are so loose you can pull them right all the way out. Of course, many Rover V8's have been known to run with the shifted liners for many years. Apparently the sympton is a clacking noise usually when the engine is cold, but this is not very conclusive as just about everything clacks on the Rover V8.
Good luck
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Current:
2005 Land Rover LR3 V8 SE
2000 Land Rover Discovery II SD
1992 Land Rover Range Rover County
Also current:
1995 Mercedes-Benz E320 Wagon
2002 Volkswagen Eurovan GLS
1996 Ford Explorer LTD 2WD
1982 Volvo 240 GL Diesel
Previous Rover:
1995 Range Rover 4.0SE
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