According to Dan, and Greg Banish
www.detroitspeedworks.com , and TFS:
Yes, those heads have the O-ring groove in them. Use Fel-Pro # 1006 headgasket.....
Thanks,
Artie Kakiou, Technical Advisor
Email: akakiou@Trickflow.com
Tele: 330-630-1555 Ext: 6324
Ok, ok. Just making sure! Thanks.