Stock crank pulley size?

[desolate]

Stick with the stock one on a street car. The crank pulley is there to dampen the harmonics. You can put in a 1g or 2g. My 1g crank pulley went bad and I just swapped in the 2g crank pulley. There is a small weight difference with the 2g being a little heavier, but it appears to be built better.