One of the problems with not using the correct tools is that if the incorrect tool slips, it can damage the lifter bore and then you're really screwed. Even using the valve bridge tool, if you dont' have the correct diesel tool it can happen. This information is the advise of an experienced MB mechanic.

I would strongly suggest "ignoring" the valve stem seals unless you have the resources to do the job correctly.

Increased oil consumption in a 350 might be destruction of the block/bending of rods? I realize you've made it a long way already and it may not be the problem. Also possibly increased oil consumption from the turbo ?

Regards,

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Brian Toscano