This is a set of race heads that were fresh when I bought them, we lost two pistons on the Dyno which dinged the heads a little bit but we had them checked and have ran since, only 4 passes on the lake.. I was told by my machinist that they were 18° heads and 56cc chambers and 226 cc runners. They do come with T and D shaft rocker set ups on each head as well as offset roller lifters and pushrods. These are raised runner heads. Please feel free to call me with any questions and I will try my best to answer your questions. 775-224-4073. Sold as is. I also have a weiand 177 blower intake for these raised runner heads custom made for 400.00. I can send pics via email or text, I can't seem to get them to fit the sites parameters.