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To replace they have to remove the wheels, mufflers, muffler supports, engine tinware left and right side, lowering the engine a bit and then you can easily remove the cam covers. I can do this in a day providing all the bolts on camcovers and other parts bolted to engine case go out easy! This can be a major pain in the **s and for sure add labour time so 12 hour job is in my opinion a safe estimate. While in there ask to check for play on valve guides and change sparkplugs.
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