The GM Performance LS3/525 is a great motor as is. If looking for 550-575 crank there is no reason to start throwing away bottom end parts. With long tubes and good tuning you'll be likely at the 550 mark without changing a thing
Lots of guys run stock rotating assemblies up to 800 HP without any issues at all.
The GM hot cams are easy on the valve train with their relatively low .525 lift and longer durations.
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