Replacement Valve Seats

That's about what I have found. I've hit 290 with 45 degree seats and 294 with 50 degree seats, but that's with clay in the chamber, so I guess it's cheating. My ports are also not that stable beyond 500 lift, so I have work to do.

It’s a lot of work to take 20-25cc out of these heads but I’m not paying anyone to cnc it for me. I’m stubborn that way