I saw a pair of the Brodix B1BA ASCS spec heads that are basically the heads above, but they had the six bolt head bolt pattern machined into them. They have ASCS cast into the intake ports. Might be a good head with someone with an R3 block with the 18 bolt pattern and yet want to run standard intakes and headers. I can't find any photos of them anywhere on the Brodix site. I guess they are top secret to the Sprint car guys.