I have the full ferrea vlavetrain setup (valves, retainers,springs)P&P on a d16z6(cp pistons,eagle rods) with stock cam
how many rpm can these take?

 

10,500 or so

 

on a sohc? same as the dohc

 

It really doesn't matter how high you can rev. Ferrea parts can spin up to 11,000 with no worries. However, reving that high with stage 2 cams or sometimes stage 3 won't make a difference. In fact you will lose power when reving higher than what the cams were made to do. What type of cams are you using? Check with the maufacturer and find out what the usable powerband is. Then you will know where to set the rev limiter.

 

I might be going with a SC52 turbo so I will need more rpm, I hear you can go 8,000 on a stock z6 cam so I'll shoot for 8-8.5k due to turbo lag