Hey Brent, has been a while. If I remember correctly they are ported to Felpro 1262 intake and 1415 exhaust, bowls where cleaned, enlarged and blended. Converted from pedistal to stud mount rockers, new springs good to .550 or .570 lift, not sure on that, new seals. I think 1 chamber had the valve seats replaced and some minor weld repair work. Nice heads I might want to buy them back if you are not going to use them?