Camshaft selection

[Xenon]

As for the cam size -check the existing push rods. You might find longer push rods that would indicate a smaller base circle cam. You could look at the lifters too to make sure there aren't longer lifters in it. Otherwise, you may need to pull the cam and see if it has a part number on it.

As for springs - You could keep the same springs if you know the old cam was more aggressive. Since it seems you don't know what the old cam was it would be a good idea to just use the recommended matching springs.

thanks. That's what I needed to know