Would they consider the Hanno Special liners as the same? Bore and stroke are the same as the earlier long-stroke version, but they have the additional exhaust port notches.
I'd take a couple of Hanno piston/sleeve combos. I had three OS .61RF ABC-Ps with PS piston/sleeves. Lots more power and incredible durability compared to stock OS. Wish I'd kept them[]
-Will B.