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In addition to other advice may I add.
Be sure to measure and calculate your shim sizes for valve clearances before installation of the new hushers. The hushers take a few minutes of running in to compress a bit. After that they do not affect the measured clearances but right after assembly they will be pushing the buckets and shims right up into contact with the cam, it will be almost impossible to slide in a guage and if you do it will be very tight and hard to know the clearance. After the engine runs for a while the clearance will "appear".
You may want to install your new shims, bolt down the cam temporarily, check clearances, then go back and put in the new hushers. I learned this from my own experience when I did the same job on my 88 740 when it was around 200K. Only 2 valves needed shim changes. Hushers were shot.
BTW @ 108K your engine is a baby. You most likely will find your clearances are fine.
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David Hunter
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