The car can spin the tires without effort, whatever gear. I couldn't tell you if im even getting into the secondaries most the time. My father and I went for a longer drive with the car to see how it would do after adjusting the timeing. It was running great! My dad says we can still put in at least another 10 degrees of advance. So we stopped at a local parts store to show off the creation. The parts guy said we were some mad scientists, putting the 415 in. We were less than a mile from home, and next to the parts shop... So when we left, I made sure I hit the secondaries, smashed the gas, and went through all the gears. As I slowed down for the stop light and turn the corner, the car shook real bad. In seconds the car got hot. I learned last time how quick this thing will over heat so it was time to shut it down. Imediately I figured that I threw the belt, again... But, I also found the Harmonic Balancer came apart. I jogged home, got the trailer and towed it home. Replaced the harmonic balancer with a fluid dampner.