[blykins]

You'll gain some torque with the longer stroke. My 425W was a 4.060" bore and a 4.100" stroke. It was very easy to make power down low. Nothing special was required. I had an Eagle forged crank, forged H-beam rods, girdle, etc. Just took a little clearancing of the cylinder skirts. That was on a D9 production block....again, nothing special.

Nothing's wrong with adding cubes...