i am running a 91 LS and am about to put some crower dual valve springs and Ti retainers in.. is it hard? i have never done this. do i need any special tools? any tips/ tricks would be helpful . thanks guys.

 

you need a torque wrench, and the torque specs (someone here can prolly spit it out with out even thinking about it)...

 

have you hit up cylinder heads unlimitied in salinas?

 

you'll also need a feeler gauge to get the correct tolerances for the rocker on the valve. In case you don't know what it is its like thin pieces of metal at a certain thickness and you just slide it down and tighten or loosen until appropriate tolerance is obtained.

 

I would not recomend you doing the job if this is your first time at it.
For the spring removal. you will need a valve spring compressor.
there is just too much to do for someone w/o experience and way too many ways to screw it up. I have done it a bunch of times and replacing the valve springs is a full days work. you have to work on one cylinder at a time so you don't accidentally drop a valve into the cylinder. plug all possible holes a keeper could fall into, etc.