Admission and Escape Cavalier Valves 2.4

Hello everyone, I hope you are well ... my question is the following .. what are the measures of the admission and escape valves of Cavalier 2.4 year 96 I need to know the long one of the head of the valve I still think that the ones that put them are a bit long and that is why I break the piston some help please I have the manual of the cavlier but indicate the measures of the head of the valves ..

It is difficult to have those measures if they do not come out in the workshop manual, but look for the American Chevrolet S10 manual that is in the manual section if that information comes out the engine is the same so that there is no problem.