No oil pressure to the rocker shafts.

Head gaskets? The oil passage comes up through the deck into the heads.

‘if I take those shafts off and just have the holes in the cylinder head exposed. With 80 psi and a drill for priming. Would that give me enough pressure to leak out and check that way, without pulling the engine apart.
I don’t think I put the gaskets on wrong. But there’s no oil up there so I didn’t do something right