Hi guys, I'm looking for some advice, does anyone know if a .15 piston and sleeve will fit into a .12? From the specs it has the same stroke as a .12 and similar size block as the mounts are the same, similar size hole in the crank, is it likely that the .15 sleeve will fit and just has a slightly thinner wall, or will it have a differenty machined block? I have a few v12 Rbs, that are collecting dust and I've found a shop who has some rb .15 piston and sleeves, but I'm reluctant to buy it if it won't fit as no one else would probably ever want them. How would a .15 this age compare against today's .12 engines? Better or worse? Thanks for any help