Jim Ketcham
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You should be able to turn the cams by hand turning the cam cogs. Remember you are compressing valve springs so there will be resistance. I have stiff springs and 104 cams and can still turn by hand. As you turn resistance will vary significantly as you compress and release springs. If you want to be sure of piston position look thru spark plug holes with a flashlight to see the tops of the pistons. You can also use a small wood dowel thru the spark plug hole and measure how far down each piston is.
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