The hemi valve angles are what makes them so great NA, that is not a down fall at all. If any NA down fall it it the heavy pistons required with high compression ratios. The ports may be a hair big for a NA 426 but throw a few more cubes in it and they are not too big at all. With a maximum effort port job and 550 or so cubes you can make close to 1000 hp with the stock castings so they are no slouch! Try that with a 906 or even a factory Max wedge casting.
BTW how small can you mill the hemi chambers down to any how?
