Harmonic Balancers

Look around at the track if you want an idea on which is the weapon of choice for nearly any part.
That being said , I have ATI's on two of my motors and am more than happy.
One is as far from stock as you can get , so I went with the big Chev bolt pattern for pulleys.
This opened up my choices for crank trigger and pulleys tremendously.
P/N/ 918280 http://www.summitracing.com/parts/ATI-918280/