What is the procedure/tool for compressing the valve springs with the cams in the car to remove the lifters without pulling the cams? I'm trying to get some parts from the Pick and Pull and someone stripped the cam tower bolts trying to get the cams out. I'm after some solid ball studs. Is there a difference in lifters between M117 engines including the aluminum engines?
Also wondering will 5.6 cam towers fit 4.5 heads? I think I read there was a slight angle difference in the bolts.
Tks!

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT