Quote:

With 155 mains & no shim the idle is better (smooth @ 1000 RPM)



Neither of those items should affect idle. The mains should not be contributing when the throttle is closed. Something else changed. Like Dog said, you need to dyno it to make improvements at this point.

'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy