On a stock bottom end lq4 with .30 milled 317's and 1.7 rockers, whats the most lift you.can throw at it before ptv issues?

 

You need to be looking at valve events and duration not lift

 

Ya its about duration more than anything. With that being said, I believe you can still fit an MS4 in it, having dished pistons and all. However that cam may not be what you need for your application. Bigger isnt always better.