I might be getting my information mixed up with the F22B...however I want to say the F20B is a lego motor where you use F22 exhaust manifold/intake manifold, any B series cam gears, and the pistons/cams/rods ect is all special because it is pretty much a destroked H22, giving it a similar/better bore/stroke then a B16. I am pretty sure it revs nearly to 10k stock, and make 220 crank HP...or is it 205, I don't remember to be honest. I think you'll be limited on what you can do to it as far as internals go. But with 11.2:1 compression you wont need to do much other then get some cams, cam gears, intake manifold and exhaust manifold and a sick ass tune to make some nice numbers. FYI they are made to take 100octain in Japan, so have fun with detonation.