Can anyone shed some light on this subject?

Can there be long term or short term problems with using toda springs and itr retainers on a motor reving to 9k on skunk2 pro 3 cams?
I know the itr motor revs close to 9k and am sure honda would not only test there retainers to just over that, so my question is can the extra amount of lift on the cams create any problems?

Think I've coverd everything, information on this would be great.

 

Toda Racing valvesprings are VERY stout for use of many of these camshafts provided that the valve lashes, spring seat pressures and install heights are proper.

 

Well my main concern is that when I build my high comp motor and big cams, is having oem itr retainers going to be a problem? Will the be put under more stress and breakup?