I have a 427 build I started years ago. Just don't need it.

It is 4.125" bore with a 4" stroke. Considerably more worth while than a smaller bore with longer stroke. You have to remember stroke pretty much moves your power range down in RPM. I did it due to J heads and 59 degree lifter angle. No neeed to turn it 8,000 with a 4" stroke can make the same power at 7,000.

Career best 8.02 @ 169 at 3050# and 10" tires small block power.