I'd really have to dig for it. It's been forever ago. He got with Erson on it and they ground it for him and even had the camshaft available. But now, they don't have anything for the slant anymore and hardly anything else. I think the advertised was something like 280/270, I honestly cannot remember. I was actually going to try one and then he posted their results showed it gained nothing. I think it even lost some.
@Jim Kueneman might know a little more.