I bought a set and had them CNC ported. I have to say, they rock. Still way less than 2k into the whole deal and I'm hoping they will be the last heads I buy. great on my street car and could be used on a race car as well. I put lots of $$ into ported iron heads back in the day, they all cracked eventually. If you would have told me 20 years ago that I would be able to buy complete 440 aluminum heads that flow great for a grand I would have asked what you've been smoking. Just buy a set, you won't be sorry.