Been looking for an RB26 head for while to do an RB26/30 conversion. I had a guy respond to an ad I put out and included pictures of the head he has. He says currently it has RB20 cam gears on it and no cover, which has me a bit sus. Is there any way of telling the difference between and RB20 and RB26 head visually?

The RB26 has 05U or 24U in the casting. the exhaust stud pattern is LLRLLR or \\/\\/ The RB20/25 cam gear back plate won't fit a RB26, one of the holes are wrong and tricky to modify. NON-VCT ex-in Cam gears are the same between 20/25/26.