Nope, they will not be building big HP engines anymore, Like there car chassis they all will have the same hp, so say what you will, they get the same C.I up to 355, and only build 550 hp.
Here’s what I saw about it. Plates, tapered spacers aero changes. May slow them down but give them the gritty-up to actually pass on the bigger speedways. NASCAR '19 changes include lower horsepower