How hard are they do get on on the M104? I changed all them on my 603 and it was pretty easy. You have to lock the timing chain to the sprocket, than unbolt the cam. Once the cam is out you can pull them out on the 603 with a magnet. The M104 has two cams so I'm not sure what that would change.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200