REV springs?
IMO, there are much better springs on the market, like the crane duals, patriot duals, or comp 921 duals (my personal choice of springs which i am currently running). save yourself some headache and get a good quality spring to begin with.
I'm on my 4th set with a Lunati grind 231/237 .598/.595 112+2 cam. I also use the West Coast Cylinder Heads titanium retainers and spring seats, NOT the REV ones.
1st set, broke 3 springs after 4,000 miles.
2nd set (replacing 1st set), ran great for about 18k miles, then had 1 spring break.
3rd set (replacing 2nd set), same results as 2nd set, ran about 18k miles, then 1 spring broke.
4th set (replacing 3rd set), installed a week ago, so far so good.



