hey guys I was hoping you could help me figure out what cc my heads are. the numbers i got off them look like D2O6 AN. If it helps they have an adjustable valvetrain, but then it also looks the the heads have been worked over.
Hope you can help.

 

Probably D20E PI heads. They came with rail rockers and all you have to do to make them adjutable is change the lock nuts. Great heads.