Actually the b17a crank fits nicely in a b16a block. B17a block casings are the SAME as a b16a block casing. You would have to run b17a length rods. The rod ratio is about 1.68:1 which is real good for a Honda. The displacement would be 1826cc's so a little more than a 1.8L. This would be a very good block for forced induction including nitrous. As ar as compression goes I don't deal with nitrous much but 10.5-11:1 seems good. The only problem is that b17a cranks are really hard to find sometimes.