why do you have valve reliefs cut?
You state that the short block is a "standard bore L6 2.8". You shouldn't need valve reliefs cut using any Nissan head, and any compatible valves. If the short block was a 2.4L, valve reliefs would need to be cut when installing the larger/later valves, or a head with such valves.
With the 2.8L 86mm bore, there is no need for valve reliefs. Have you done something completely out of the ordinary and installed a completely different set of valves (say chevy or something else)? Otherwise, there is no way that your valves would come in contact with the cylinder walls.
On to your question:
Stock replacement head gaskets:
Fel Pro is good - 89mm bore
Victor (sold at Napa) is also good and has an oblong (not circular bore) ranging from 90mm lengthwise to 88mm across. I know this sounds strange....but IO have 2 of these in my garage right now and the bore is NOT circular.
I would use the fel-pro as it is the most readily available...also the quality of the gasket seems superior IMO.
The HKS gasket is the ONLY gasket with a bore exceeding 90mm. It is a 91mm circular bore. I have this on my car now. Others will say otherwise, but I believe this gasket is more trouble than it is worth. It is too expensive to start with,and **** near impossible to get the water jackets to seal.
