Hi, i have idea to regrind camshafts
Are disadvantages?
Maybe know where i can do this?

good V6 opel camshaft cost to much...

Used to be common enough to regrind cams. Depends on the material though and only suitable if cast.


http://www.newman-cams.com/camshaft-material/

30 seconds on google brings up Dbilas and Courtenay who will regrind your cams.

these guys have been doing it for decades
http://autosprint.co.uk/?p=p_11

Any one with the right tools could grind a camshaft, its the hardening process after, and keeping it 100% true is the difficult bit