Inliners International Forums General Discussion Blown and Injected 67 Camaro - Blown 250

yes it looks like thesilverbuick is correct. there is an oring that goes in the lower groove.

if the same procedure for a small block head applies to these heads then here is some info I found for ya.

http://www.hotrodders.com/forum/umbrella-type-valve-seals-152885.html