How easy or how difficult is to install beehive type springs on an EVO without removing the head from the car? I mean do it at the same time cams are installed but without removing the head. Have anyone done it?

 

Its not a hard job, just have to be patient and have the right tools.

 

Which is the best tool to use?

 

I did a valve seal job on a 4G63 and I pulled the cams. So whatever tools you use to set the timing belt were required. Also, an on-head spring compressor. I think the one I have was made by MAC Tools. Finally, some rope to shove into the cylinder so the retainers will release.

The retainers on these valves are tiny. I magnet will collect them when released. To replace I used a slightly magnetized screwdriver. Expect lots of dropping so have any holes in the head plugged.