I'm in a hurry to get the '69 back on the road by this weekend for the Rogers meet...
With four broken rocker arms and a broken stud in the head it was time to replace it. So I removed the old head and the head from a spare motor I had in the garage. Upon inspecting the head from the spare motor, I was pleased to see that it was a fairly recent rebuilt head. It was very clean with hardly any buildup on the valves and it was pocket ported and gasket matched... The cam looked aftermarket, but not really up to the higher compression, dual Webers, headers and such... SO, I wanted to keep the Shrick 292 cam from the old head.
However, having never changed a cam on any BMW engine before, I had to do a little research before getting started. Turns out, you are supposed to have this nifty little tool to move the rockers out of the way while someone else carefully removes the cam. In fact, you have to have at least THREE of the nifty little tools...
Needless to say, I don't have ANY of those nifty little tools and I didn't have any extra hands sprout from my sides recently either...
So here is what I came up with after thinking about it all day at work. I adjusted all the rockers as you normally would except I tightened them all the way down on the cam. Then I turned the cam until one of the valves was opened all the way and gently stuffed a shop rag between the valve and the valve seat with a flat screw driver. This way when the cam rotated the valve stayed open. I did this four more times on other valves until the cam was free from all valve spring pressures. Obviously you don't have to do all of them as some of the lobes will be facing down while the others are opening valves... Now that I had the cam somewhat free. I backed the valve adjustment all the way off to give even more clearance from the cam. The old cam slid right out and the Shrick slid right in! After securing the new cam, I rotated it to open up all the valves that had rags holding them open and removed the rags one at a time.
Here are a couple pics to illistrate: