Magnum replacement heads?

Absolutely.
I'll probably buy an aluminum LA set for another project.. but for my truck, that i use for work ,and has that big mount bracket and all those accessories like a/c & ps.. bolt on is what i need. The Machine they used to cut them.. tons of them, no wonder. Im going straight to 2.02/1.60 valves. Should have them on the flowbench tuesday/weds. But its just a 4x4 truck, if i just blend them and they happen to flow 250 or 260, good enough...maybe.

Just looking at the pics you provided I can say with 90% surety that those are one and the same CCCN Magnum replacement heads AKA Chinesium. I cannot see them approaching 250-260 cfm without a TON of work. I can still order those from my supplier and revisit them but until I get struck with a masochistic urge I won't. J.Rob