Install the cam gears without the chain, then place a straight edge against the sprockets, and try to insert the appropriate feeler gage in between the straight edge and the cam sprocket. Check SM for proper feeler gage. If you can fit it in between the two, you need to use a different cam spacer. The cam spacer kit isn't included in the 117 kit. When you measure this, set the timing marks so it's easier to install the gears when you get the chain on it.