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1970-1995 Range Rover Classic
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The head came back from the shop with its valve springs upside down. After repairing and installing she continues to "miss." Compression values are: 145, 90, 115, 120, 140, 130, 130, & 125. Wet testing the 90 value jumped to 110. Gonna install new rings at the 90, 115, & 120 pistons. Thought I'd post this to see if any other info came from the forum. Thanks.
 

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Did we not have this discussion earlier? The springs on the Rover v8 head have no orientation unless you have some aftermarket spring.

Anyway, not the head(s) is/are done, you will have to check the pistons. Fitting new piston rings is not necessarily the solution. You could have excessive wear requiring overbore and oversized pistons. IF you find just an issue with the rings and the bores/pistons are within spec, you can hone in situ (AND DO AN EXTREMELY GOOD CLEANING JOB) otherwise you are looking at removing the engine.
 
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