Wow ! Loooong thru' bolts! Nicer looking cylinders, Nikasil; is just a trade name, everybody and his mate produces good quality plated liners now . Also for many boat engines , snowmobiles, Dirt bikes (2 and 4 stroke) chainsaws ect ect. nothing new or to be afraid of there. Great heat transfer, very low wear and good ring sealing ( once you run them in , which will be tricky) Just four nuts per head? May well be OK.... But those through bolts, hats off to Jab if they make that work.....