just wondering whats the biggest cam lift and dur you can put in a stock bottem end with gt-40 heads and stock valves without notching the pistons because i have a z-303 specs are 552 lift 292 dur !
Of course the issue isn't lift, but duration. Every combo is different when it comes to close tolerances. You have to measure yours to know what clearance you'll have. No way around it. Here's a link that explains the issues in layman's terms.