Anybody ever swapped out a heavy( stock) rotating assy for lighter aftermarket?

I’d still go with the 4” stroke and a 20-ish cc piston.
Mid-10’s cr, even with a 58cc head.

I like cubes.

And the bobweight is even lighter than a stock stroke combo because of the shorter piston.

The bobweight of my (at the time) tricked out 340 was 1650g.
The trw pistoned 440 was almost double..... close to 3000g.

After the 440 was put into the car, 120lbs of roll bar and floor plates were added to the car, along with how ever much more a 440 weighs than a 340.

The 440 was 1 second and 10mph faster.

I’ll take the cubes over bobweight.