Maximum rpm for SB

This is what my experience has been.

With a 340, Ross lightweight pistons, stock steel crank and Eagle H beam rods. Assembly was balanced of course I twisted it to 8000 repeatedly. I screwed up and didn't check the babbit rod bearings soon enough and it spun a rod bearing. I previously had trimetal bearings in it without a problem for two seasons. The babbit lasted only 1.75 sesons. We were racing every weekend though then for eight months.

The current MP shortblock 360 with Hyperexplosive pistons, stock cast crank and stock rods with ARP bolts in it, not very well balanced at all sees 7200-7500. I checked the rod and main bearings after a year and a half and they were fine. Again trimetal bearings not babbit.