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

No mention of the heads in the above post.
Were the exact same heads used for both examples?
No additional work to the heads between tests?
If so, what was the ET difference?
What are the ET’s when corrected to a std day?

I’m pretty sure my friends Stock eliminator Pontiac 350 has a heavier bobweight than Dons 360.
Along with a much smaller cam(.420 lift), and heads that have smaller intake valves(1.96) and probably flow 60cfm less(200cfm), and saddled with the factory dual plane intake manifold.

It’s been about 1/2 a second quicker and gone 4mph faster(10.80’s@123, @3300lbs).

IMO, there are many many things on the list of go fast goodies that will have a greater impact on the ET than a few ounces of bobweight.

Unfortunately, even if Don undertakes this approach..... we won’t get a real
answer, since other aspects of the engine package will be changed along with the bobweight(compression, ring pack, etc).

In Stock eliminator, the NHRA legal pistons are stock weight, and you can only use approved connecting rods.
So, there are NHRA legal Stocker 360’s running as quick as Dons car(and quicker), with very similar weight rotating assy’s, that don’t have the benefit of ported aluminum heads that are milled to 58cc’s and have 2.02 valves, aftermarket intakes, 950 carbs and .560 lift cams.

Just sayin......