Im thinking about trying this. What I was going to do was drive my euro R prelude around get a hold of an H23 block, and build it to avoid the downtime. Would it be worth it if I left the H23 block alone and put the Euro R head on there. How much of a TQ increase am I looking at? What do you guys think? I think it would also be a different stroke because of the H23 crank . stroke, and bore :D