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Lots of people on here love turbos and don't own one. Lot of people here also love NA. I recommend the gsr block because it was built to rev higher. It's good because you have a more useful revrange, and keep in mind that the fast your engine revs, the more combustion you are going to have give a certain time, i.e. more horsepower with less displacement. That's what honda is pretty much all about. You can build either the b20 or the b18c and effectively run the same amount of power, but the b20 is going to operating at a lower engine speed, thats all. I'd do the gsr block, because it was an engine with performance in mind from the factory: better revvability, block girdle, oil squiters. There is just going to be a lot less stress on the gsr block than the b20 at higher engine speeds. I am not saying the b20 isn't doable, because it is easily doable, it's just that the gsr starts out with more advantages. If you build them, both will be very capable. If you don't want to do a whole lot to the bottom end, the gsr is better bang for the buck. My .02, take it as you will.
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