depending on the core they can also tighten up the LSA as well as there also being more specs available that are not on the website. I called in and talked with them once the cores arrived. I have yet to finish putting a car together to run them but working on it.
Yeah, their web site hasn't been updated in like twenty years. Something about they lost their web master and nobody knows the passwords and other info. Ken will send you the updated grind lists, though.