I have an older set of 165cc heads that have a groove in the combustion face. I have changed to Cometic head gaskets this weekend due to coolant leaks and found that they have a specific gasket for these heads. Did this groove get deleted? What does it do?
I have some AFR 165 heads, bought them a few weeks back and they advise Fel Pro [for 1983 - 1995] Fel-Pro #1011-2. Looks like the design might have changed? http://www.airflowresearch.com/sbf_install.php