not to sway sides to this conrod debate, but i had mine changed after run in + 2 race meets... 6L through the engine.
my LHS recommended it due to these rods failing and destroying the engine. they recommended the novarosi engine and claimed that i'd be hard pressed destroying this engine now. i paid $60% off RRP for engine/pipe combo so an extra $70 didn't worry me.
onto another note... last race meeting i had my engine properly race tuned. i can still go a little leaner on the top end, but this engine is creating a serious amount of power.
In my first race meet after run in. i canme 2nd in the B main final running an engine that was way too rich on the bottom end and still managed reasonable lap times on our track.
awesome engine. good run times. was running 8.5min before race tune, not sure what i'm getting now.