I have a friend thats thinking about putting a texas speed magic stick 4 cam in his 01 T/A. lift is over .600. what size valve springs should he go with? where is a good place to find them?

 

The size that fits his heads.
You don't get valve springs by size. You have to get a spring that will allow the amount of lift that you want without binding and that has the right amount of open and closed pressure.
I would call Texas speed and see what spring/retainer package that they recommend. Probably Patriot gold dual.

 

TSP will recommend their PRC dual springs, which will do the job.

The COMP 921's are best equipped to handle the job, but are damn pricey