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I should also add that you can test to see if yours are ok by removing the cam cover(no need to have them out), and pushing down on the tops of the ones with CLOSED valves under them with a rag wrapped screwdriver. they need cleaning if you can easily(firmly?) push them down even a little. this should also show itself as ticking sounds.
All of this info is applicable to the K series v6s aswell
from what i've seen, you could be loosing upto 1/3 or more of your lift, and at a guess 1/3 of your power aswell.
Fred.
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