That ad is a little bit of a play on words
“ most hydraulic roller and mechanical roller camshafts with cast gears.”
The key is the part that it says with cast gears. you can use cast on cast, Bronze on steel or steel on steel, However if you use bronze on steel consider it a maintenance item, it will wear and ultimately can leave you stranded. Most of us use steel on steel nowadays, Well, assuming we can get it again or bush like Brent is doing.
