Interesting. Sounds like an inexpensive way to avoid burning racing gas. Since 440 rods are lighter than Hemi rods, and pistons weigh the same, it sounds like it may work with the 440 external balance stuff. A Hemi crank probably costs a bazillion dollars, if you can find a used one.
That brings up a question. Since a Hemi is internally balanced, and has heavier rods, why did Chrysler go to external balancing when they put 6 pack rods in the 440's?
