I've used them with .050 on the stock top rings and more on the second rings with no issues
I now make sure I have at least .020 on the top rings with .024 or bigger on the second ring with no power adder, I do add .006 to both rings or more onto the blown gas street motors I build to both rings, depending on the heads and carb sizes and expected power levels (I've used .026 on the top ring and .034 on the second rings on a N/A B1 motor with a 4.495 (EDITED ) bore size) that made 920+ HP on race gas on the dyno breaking it in with good results with no vacuum pump I use the .0045 per 1 inch diameter on the top ring and .0050+ on the second ring on N/A drag race motors
It is way better to have .003 + to much end gap than .0001 to little