Don't know how big of a cam you are looking for but I recently got quotes on a mechanical roller from Jones, Schneider, and Racer Brown and they all confirmed they had cores on hand and were looking at 3-4 week lead. I was looking for something in the .600-.625 lift at the valve. Racer Brown was not comfortable with that because his lobes would get through the hard layer on something that small, so he wanted .650 or more lift on the cores he currently had. Howards gave me a longer lead time and the order had to be made through a third party like Hughes or Summit. Bullet had cores as well but was 6-8 weeks lead. I understand the lead time, this is the busiest time of year for them with everyone trying to get builds done during the off-season, at least up here.