[Walt Dupont--Me.]

I've changed cam without removing valves. of course you must have adjustable lifters in your engine. Remove heads, pry valves wide open with a pickle fork under the valve stem, install a snap cloth pin under the valve head, roll engine over ( I hope it's not still in the car) lifters will slide up to the valve stem, remove cam, reverse instrustions. I like to use 59ab gears so the cam will thrust back against the block. Walt