It's a trade off. The 225 is 55 more cubes. However, it has a really long (4.125") stroke. So in the rev department, the 170 has it beat. The short stroke allows the 170 to rev quicker. We have members here who race the 170 in different forms with good success. None of the slant sixes will ever be a V8, but they are a lot of fun. @Charrlie_S is really famous in the slant 6 world and has raced them for years. Maybe he will chime in, since I tagged him. He can further help dissect the differences.
