[DavidNJ]

A Crower BBC crank weighs under 60#. If you take a cast and alloy crank of equal strength, the alloy will be lighter. Which 'forged' crank are you using for comparison? Don't the Scat cast cranks have gundrilled rods, 2.2" rods, and profiled counterweights?

The difference from density would give a 4# advantage to the cast. On a strength basis, the advantage should go to the alloy steel. For reference, Scat lists their BBC lightweight cast crank (equivalent to the FE) at 67# and their BBC cranks at 70#, 65#, and 59# for their standard, light, and superlight weight respectively.

What it feels like in your hand and what it feels like to the engine are not the same thing. The physics is very clear. and easily calculated. If an 80# crank was an infinitely thin hoop at the outer edge of the connecting rod throw, it would have less inertia than a 13# 11" flywheel.

To me its amazing, given the limited selection of FE parts, that there are at least three aluminum blocks (Pond, Genesis, Shelby) to choose from.