Due to a recent change in tire size my motor is seeing more RPM's than I originally thought. I changed from 33x15x15 high growth tires to 32x15x15 tires. The motor is an sb2.2 small block with a relatively mild cam and is now going through the stripe at 9,000 rpm's. It is pulling hard and not at all laying over, but I am concerned that the rpm's are too much for the heavier weight of steel rods. It's a Dart block, with a callies magnum crank standard rod journals, Oliver Billet Steel rods, and Diamond gas ported pistons. Any input is appreciated.