Well, I will continue this debate, I guess
, the point being made is a different rod, even if it weighs less , meaning less rotating mass will not increase HP, now if you are saying your alternate rod set allows you to rev to higher rpm limit where your engine is still making more power, ok, but less rotating mass never made more HP, it just lets the engine get to what it already has a bit quicker. it would intresting to see what a short stroke engine rods, stock vs alternate weigh, I bet no where near the difference we see in our long stroke engines.
On the LP engines I've built, MG 1275 and 1800, they make power to certain rpm, which is much lower than that of full prep engine of the same kind do, so if the engine quit making power at say 7500 rpms, then rods that will allow you to rev to, say 8000 rpms, doesn't make you anymore HP and at that point HP is dropping like a grand piano being shoved out of airplane anyway
Maybe, I'm off base, but I don't think there are alot of serious national racers out there turning less rpms, when their engine would still making power in given higher rpm range, and thats why this thread got started, they are breaking rods, and limiting a racer to turn less rpm than his, or her engine makes because the connecting rod might break is kinda goofy. The big limiting factors in LP should be head prep, CR, and cam, those are the things that truely control a given engine's output