Originally Posted by 180SX

Unless you broke the cam by installing it wrong ( cam caps tightened down in the wrong order against stiff aftermarket springs ) and you broke it while the motor was spinning, the chance that you did not cause valve damage is about 25%... Why ? because a stock SR cam has about 248 degrees of duration which is about this number. Then you add in the fact that the cam still is spinning forward when it breaks. Pulled a lot of heads and usually broken cam = bent valves.