If memory serves me right, this gasket can not be used with o-rings. I had my heads o-rings and the gasket outer material is made out of metal. The o-ring can not "bite" into the material to make a seal. Trust me, I know with personal experience. I used the gasket that was recommended with the GN-1 heads but I o-ringed the heads. The o-rings could not "bite" into the gasket and all I had was water leaks. The o-rings held up the head from sealing. I was filling up the block with distilled water and it was leaking out and into the oil pan. I took the heads off and put the stock graphite gaskets on and everything sealed up.
I used FelPro 1026 for several years (no block O-rings) until I recently had to replace the block with one that happened to have been grooved for O-rings. So, added O-ring wire and went with copper gaskets.
Thanks for the replys.
Bill, that is what I was looking for. I assume you have done one for a 1026. I had heads o-ringed that fit a 1000 and that is the way it fit. (not figure eight as that was a smaller dia.) Last year I had a local guy o-ring my block for a 1026 (figure eight). In that application the outer dia. of the fire ring sit down on the o-ring. It did seal up ok, but I didn/t think it was right. (In both applications a .030 dia. stainless steel wire was used)
This will be iron heads on a 4.015 bore stage block. If I had 14 bolt heads I would not o-ring.