You can’t(shouldn’t try to) change the lift very much with a regrind on a roller since there is a good chance of grinding through the heat treat.

If you wanted a roller with .550 lift, you would start out with a different core.

Still, your current roller can be reground into something smaller/milder that would work fine in that application.

You could put the solid back in as well........ it’s closer to the right size....... but wouldn’t make as much power as a correctly sized roller.


Yeh...... you’re pretty far away from that, and likely not easily cured without spending some real $$.
Cam, gears, converter, and probably headers.