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

weedburner said
1st problem is I don't see my local "Rockport Int'l Raceway" on the list of tracks, 2nd problem is the history function on that page only goes back to Feb 2016. Engine #1 run was 8/18/2014, Engine #2 run was 7/30/16.

Grant

Thought it might help. I'm lucky my track is on the list.