1.5 or 1.6 rockers on magnum heads

I am getting ready to swap my magnum heads to the adjustable chevy rockers with the crane conversion kit. I noticed I can get 1.5 or 1.6 rockers. Is there any problem running the 1.5 verses the 1.6? I want to go with the 1.5 because I am also swapping my cam and most cams that I like will be well over .500 lift with the 1.6 rockers.