Only 7500 rpm on the turbo motor,power falls off after that fairly quick.we do turn our small circle track SB2.2 engines 9200 with 590 G.M. steel rods,our 3.875 stroke SB2.2 runs at 8600 rpm with 611 GM rods and our spec engines 8800 rpm with 440 GM 1.771 rods.
The cup guys were at 10,500 qualifying and 10,000 for the whole 500 miles with 480 GM rods before the gear rule. some of the new steel there using like 300M is amazing.Bill