To make installation easier, we opted to mark the relationship of each camshaft to the camshaft retaining caps.
This is where the job gets tricky: There are two ways to remove the cylinder heads without damaging the valves from piston to valve contact.
1- If you have a valve spring compressor tool designed to compress the valve springs with the camshafts still on the head you can do it that way, remove all the rocker arms to make sure that all the valves are in their closed position , that way when you remove the timing chain and the camshaft sprocket turns it won't cause a valve to hit one of the pistons.
2- We didn't have access to such a tool when we were removing the cylinder heads and we were in a short deadline, we opted to build a custom made tool shown in the image to keep the camshafts from turning while removing the timing chains to avoid valve to piston contact.
With the custom made tool holding the camshaft sprocket in place, loosen the camshaft sprocket bolts, don't remove them yet, just loosen them up.
Remove the center bolt on the lower timing chain sprocket.
NOTE: You can use locking pliers to hold the camshafts from turning while you loosen the camshaft sprocket bolts as long as the pliers have protective sleeves and they are used on the shaft not on the camshaft lobes.
Compress the lower timing chain tensioner with channel lock pliers as shown in the picture, insert a pin to keep it in its compressed position to allow easy removal of the lower timing chain.
Mark the relationship of the left timing chain to the lower timing chain sprocket as showin in the image, like we mentione before, the timing chains have colored links to install the timing chains in their correct location in the event that you forget to mark them but it is better to be 100% sure and mark their relationship for re-installation.