Does anyone know if the engine timing is changed when a radical cam shaft is installed?

Yes, It should have some Information with cam specs. You need to advance it. If your cam is pretty hot, I would try 15 degree's advanced. When you hit the starter to crank it up, if it hit real hard back it off 2 or 3 degree's. Go to website of company that make cam and ask for tech support. Depending on what type of ignition system your running you can change vacuum advance on distributor. Advancing timing will give you more power, but you will have to run high octane gas. I used to fill up at local airport in my old 69 Z28.

Deep question , Ignition timing is tied to camshaft timing , the valves will open sooner, close later and have more overlap so "engine timing" will be advanced , but most radical cams should have a double roller chain that will have the ability to affect the valve timing by a few degrees advanced or retarded , depending on what you want . so the short answer , yes to both.

Not something to worry about. No timing is altered except the valve timing and that is the reason for installing the camshaft in the first place. Of course, errors on your part could change the result.

No just install it straight up.

I never had to change the timing at all.

if you have power brakes you will need a vacuum canister to use them.

a radical cam will take away the needed vacuum to run your power brakes.

Just something to think about unless you have unhumanly strong legs.

Usually intake valve opening is advanced and exhaust valve closing is retarded. Sounds more like you are asking about the ignition timing which would remain unchanged.

Should ignition timing it be changed? Only if the specs say so.

well yes it is changed because the timing ran off the cam, if it had a plain cam then it advanced it

depends on the cam and what it was built for......but most likely would b retarded......